Watch List notes:

RUSSIA, Union of Soviet Socialist Republics. 1923-1991. AV 20 Gram Ingot (19x12mm, 20.07 g, 12h). Official Soviet fineness stamp above 20г (weight), both in incuse / Registration number A 6233 in incuse. See http://www.rarecoincollector.net/index.php?main_page=product_info&products_id=5655 (for 10 gram example). As Issued.

From the collection of Dr. Lawrence A. Adams.