N.Y. Comp. Codes R. & Regs. tit. 1, § 8.18
Except for the purpose of replacing worn out stamps or stencils or for making similar but smaller or larger stamps or stencils, no person shall make or cause to be made any stamp, stencil or other marking device which may resemble in any way the identification or grade marking stamps or stencils as provided herein nor shall any person use any marking which includes a miniature map of New York State or the letters “NYS” superimposed upon such marking, nor shall any person use a number other than as assigned by the commissioner.