Dodge, J.
Appellants’ first position is that the entire contract of February 1, 1899, was void for want of mutuality, for that the plaintiff did not thereby bind itself to purchase any stone or do any other thing. This position we deem untenable. The signature of plaintiff’s name to that paper was obviously for the purpose of acceptance. The presumption is that such signing was done for some purpose, and no other is apparent. If an acceptance, it bound the plaintiff to perform any acts on its part necessarily implied either from those things which defendants were bound to do or from the situation created by the contract. Shadbolt & B. I. Co. v. Topliff, 85 Wis. 513, 55 N. W. 854; McCall Co. v. Icks, 107 Wis. 232, 83 N. W. 300; Excelsior W. Co. v. Messinger, 116 Wis. 549, 555, 93 N. W. 459. Plaintiff therefore bound itself to be defendants’ exclusive agent within the territory named, which, by the way, included the entire territory in which defendants’ product could be advantageously sold, and to perform the duties resulting from such agency. Exactly what those duties were we need not attempt to cata-logue. They at least included good faith and due diligence in bringing defendants’ stones to the notice of possible consumers for purpose of sale to them. Such duties are shown to have been performed to the extent of the expenditure of • much time and considerable money. Hence there was an obligation assumed by plaintiff sufficient to give mutuality to the agreement that it should be exclusive agent, and that defendants should neither quote prices nor make sales.of its stone to others. Mueller v. Bethesda M. S. Co. 88 Mich. 390, 50 N. W. 319; Russell v. Horn, B. & F. Mfg. Co. 41 Neb. *193567, 59 N. W. 901. We need not at this stage of the discussion decide whether the surrounding circumstances were such as to warrant a conclusion that plaintiff should take or defendants should supply stone to any ascertainable amount— whether all the product of the quarry or all that plaintiff by due diligence might be able to sell. The breaches of this contract necessary to be considered consist in sales of stone.by defendants to others than plaintiff. We proceed to consider them.
1. Defendants sold to the Chicago, Milwaukee & St. Paul Railway 2,200 square yards of paving stone, which plaintiff had offered to sell and would otherwise have sold at a profit above the contract price of $88. Such facts are undisputed, the only excuse offered being the asserted consent by plaintiff. That is negatived by a finding for which we find sufficient supporting evidence. We see no escape from the conclusion reached by the trial court that defendants are liable for that sum. The sale by them was in breach of their express agreement, and the damage to the plaintiff was the direct and natural result.
2. A similar sale of 1,050 square yards was made to the same party, for which the trial court awarded damages in the sum of $52.20. We agree with the finding that such breach was committed, but plaintiff’s secretary testifies that he offered to make the same sale at $1.11 per square yard, and would have made it if defendants had not. That price is the same as the contract required plaintiff to pay; hence obviously there could have been no damage to it from failure to make the sale. This item cannot be allowed.
3. Defendants sold a small quantity of stone to one Kelly,, which otherwise plaintiff could have sold at an established, market price so as to yield it a profit of $143.34. We discover no evidence to warrant disturbance of the trial court’s findings to the foregoing effect. The conclusion of defend-: ants’ liability for the gains so prevented is obviously correct..
*1944. Another item of damage allowed plaintiff was $2,407.81 for profits it would have made on approximately 7,500 square yards of stone, that amount baying been sold direct by defendants to Gaffney & Long or the Gaffney & Long Construction Company in Chicago, between May 18 and December . 31, 1899. The fact of the sales was undisputed, and the margin of profit which plaintiff would have made as found by the trial court was sustained by the evidence. The defense was a written consent given by plaintiff on February 8, 1899, in following words:
“February 8, 1899.
"Wm. Bannerman, Bsq.,
“Supt. of Berlin Quarry Go.,
“Berlin, Wis.
“In consideration of certain conditions, we hereby agree to allow the Berlin Granite Co. the privilege of selling to Messrs. Gaffney & Long, contractors, of Chicago, Ill., four thousand (4,000) yards of smooth blocks, six inches deep, and between (3,000) and (4,000) three and four thousand yards of common blocks, this on old deals pending. But the price to Gaffney & Long shall not be less than $1.90 per yd. f. o. b. Chicago for 6-inch smooth, and $1.12% f- o. b. cars Berlin, Wis., for the common block.
“W. G. Tatuoií Co.
“L. Ií. Taylor, Secy.”
It was in proof that this consent was granted upon the understanding and representation that Gaffney & Long had worked up certain prospective private jobs of paving, as distinguished from the ordinary contracts let by the city on open competition, and that they held an unexpired contract with defendants for stone. The court below held that the evidence of the circumstances and purpose of this contract required a construction limiting the permitted sales to meet such purposes. We feel constrained to concur with this view. Hence such sales as were outside of this consent so construed were as much in breach of plaintiff’s contract as any of those already considered. When, however, we come to examine the *195evidence, we find none at all to show that any of the stone •sold to Gaffney & Long, either under that name or under the name of Gaffney & Long Construction Company, in which they continued business, were shipped or used for other than such private jobs, except as to that used under publicly let contracts for paving Desplaines street from Madison street to Yan Burén street, and for Twelfth street from Canal street to Halsted street. All the rest may have been for the very purpose covered by plaintiff’s consent, and it is undisputed that defendants sold it in good faith believing that to be the case. We cannot escape the conclusion that plaintiff has failed to prove any breach of the contract in this connection except to the extent of the stone for the two public contracts above mentioned, upon which the profits at the rates adopted by the court would have aggregated only $1,749.99. As a result, we must hold that $657.82 of this item was erroneous.
5. Another element of damage rests upon failure to perform a distinct contract by defendants to sell 15,000 square .yards of paving stone to plaintiff to fill a contract for the same amount which it had made to sell and deliver to the Milwaukee Electric Railway & Light Company. Plaintiff having communicated such contract to defendants in April, 1899, and ordered the stone to fill it, they accepted the order, and shipped from time to time about half the quantity. In January, 1900, they refused to ship more, on the ground that plaintiff had failed to pay some $600 then due for stone previously shipped. They thereupon informed the street railway company that they would not deliver any more on plaintiff’s contract, but, if that contract were canceled, would themselves deal directly with the street railway company and supply what it needed. Plaintiff was unable to obtain stone ■elsewhere to deliver upon its contract, and the street railway -company therefore canceled it, so that plaintiff lost the profits it would have made on the remainder of the 15,000 square yards. Plaintiff’s reason for not paying the $600 for stone *196shipped, was its claim that defendants were indebted to it in a still larger amount upon an accounting of profits up>on their sales in breach of their contract, which claim it now appears was well founded. The findings of the trial court to substantially the foregoing effect are not antagonized to any clear preponderance of evidence, although there is much dispute as to some of them. The conclusion of liability for the profits lost, namely, the difference between defendants’ price to plaintiff plus expenses of delivery and the selling price to the street railway company, is, of course, irresistible.
6. The next item of damage allowed is $684, the profits-plaintiff would have made on 1,800 square yards of stone which it had opportunity to sell to one Kelley, but was unable to because defendants rejected its order therefor, made October 26th, for delivery November 15th. In order to sustain this item of damage the court must have held that the contract not only forbade defendants from selling stone to others, but also required them to sell to plaintiff all that it should order for actual sales made by it, at least up to the output of defendants’ quarry; otherwise there was no breach in refusing to accept this order. We shall not deem it necessary to resolve this somewhat doubtful question. Conceding, arguendo, such construction, it is entirely obvious that the defendants did not agree to sell plaintiff anything except the output of their quarry as ordinarily operated with reasonable diligence. The latter could therefore suffer no more loss than the profits to result from a resale by it of all that stone. If defendants had sold it all to some one else, and plaintiff had also taken orders sufficient to absorb it all, it could not recover' difference between contract and market-price upon that sold by defendants, and in addition recover difference between contract price and sale price on that for which the plaintiff had taken orders. That would obviously be duplication of the damages actually suffered. Now, while the trial court has found that defendants could have produced *197tbe stone to fill tbis order for Kelley after October 26tb, and while that finding is perhaps supported by some evidence, it is perfectly clear that they could not. have produced stone to fill that order, and also those accepted by themselves, on which they have already been charged with damages. The late deliveries to the Gaffney & Long Construction Company, and the required deliveries to the street railway company which they did not make, but on which they have been charged for loss of profits, would by the clearest evidence have more than exhausted all they could produce within the contract term. 'The order taken from Kelley only serves to prove that plaintiff could have sold so much of the stone that defendants disposed of elsewhere. When, however, it receives the profits it could have made on that stone, it is fully compensated. We hold, therefore, that this item of damage was not recoverable in addition to the other allowances.
The result of the foregoing is that the trial court erroneously allowed $1,394.32 of damages, which, with interest from commencement of suit, July 7, 1900, to date of findings, January 10, 1903, has entered into the judgment, which therefore is improperly swollen to the extent of $1,597.39.
By the Court. — The judgment is modified by reducing the damages therein awarded to $2,210.49, and the total to $2,487.14, and as so modified is affirmed; appellants to recover costs in this court.