The final medals, 1976 and 1977, were oval and of pewter. The 1977 medal, depicting Martha Washington, was not needed for presentation, as no public assay commissioners were appointed. They were presented to various Mint and other Treasury officials, and when there was public objection, more were struck and were placed on sale for $20 at the mints and other Treasury outlets in 1978. Material was available for about 1,500 medals, and they were initially not available by mail. They were still available in person, and by mail order, in 1980.

All Assay Commission medals are extremely rare. Except for the 1977 medal, none is believed to have been issued in a quantity of greater than 200, and in most years fewer than 50 were struck.