New York Consolidated Laws, Not-For-Profit Corporation Law - NPC § 505. Subvention certificates

(a) Each subvention certificate shall be signed by the chairman or a vice-chairman of the board or the president or a vice-president  1 and the secretary or an assistant secretary or the treasurer or an assistant treasurer of the corporation, and may be sealed with the seal of the corporation or a facsimile thereof. The signatures of the officers upon a certificate may be facsimiles if the certificate is countersigned by a transfer agent or registered by a registrar other than the corporation itself or its employees. In case any officer who has signed or whose facsimile signature has been placed upon a certificate shall have ceased to be such officer before such certificate is issued, it may be issued by the corporation with the same effect as if he were such officer at the date of issue.

(b) Each subvention certificate shall when issued state upon the face thereof:

(c) The fact that the corporation is a not-for-profit corporation and, where appropriate, that the certificate is transferable at will or subject to restrictions, shall be noted conspicuously on the face or back of each such certificate.