California Code, Penal Code - PEN § 651

It is a misdemeanor for any person to buy, receive, sell, give away, dispose of, exchange or barter any Federal order stamps except for the foods or cotton goods for which they are issued.

This section does not apply to any person buying, receiving, selling, giving away, disposing of, exchanging or bartering any Federal order stamps subsequent to the redemption of such stamps in the manner provided by State or Federal law for the foods or cotton goods for which they are issued.

As used in this section, Federal order stamps refers to stamps issued by the United States Department of Agriculture or its duly authorized agent for food and surplus food or cotton and surplus cotton.