N.Y. Comp. Codes R. & Regs. tit. 15, § 23.7
(b) If a motor vehicle was manufactured 25 years or less prior to the current calendar year, an applicant for historical registration must submit the following, in addition to an application for historical registration and all other items required for a standard registration:
(2) A photocopy of supporting documents which verify that the motor vehicle in question qualifies as a collector's item or exhibition piece and meets one or more of the cirteria set forth in section 23.4 of this Part. Such supporting documents should include either or both of the following: