RI-18a Potato Revenue stamps, 50lbs, series 1935, pane of 12
These stamps were required by the Potato Act of 1935, an amendment to the Agricultural Adjustment Act that became effective Dec. 1, 1935. On January 6, 1936, the US Supreme Court declared the Agricultural Adjustment Act unconstitutional. Officially the Potato Act was in effect until Feb. 10, 1936, when it was repealed by Congress. Genuinely used copies are rare.