25 C.F.R. § 310.7
All marks shall be applied to the article with a rubber stamp to be furnished by the Indian Arts and Crafts Board. Each stamp shall bear a distinctive letter and may be used only by the person to whom it has been issued. With the addition of the distinctive letter, each stamp shall read:
( )
Hand-Made
Alaskan Eskimo
U S
Indian Arts & Crafts Board
I D
or, in the case of articles too small to carry this stamp:
( )
U S I D
Alaskan Eskimo
On baskets and fabrics which offer no surface for the application of such a rubber stamp, the stamp shall be placed on a paper tag attached to the article by a wire caught in a lead seal disc that shall be impressed and made fast with a hand seal press furnished by the Indian Arts and Crafts Board.
25 C.F.R. §310.7