Upper Left: 210 size (large rifle), brass cup, domed, two-leg brass anvil, no lacquer over hardened green putty-like compound and anvil, light-colored wood tray, lot number A-25.12.4 (?Saturday, 12 April 1952?).
Upper Right: 215 size (large rifle magnum), nickel-plated cup, domed, two-leg anvil, transparent red lacquer over anvil and composition, dark-colored wood tray, lot number AL.75/24/5 (?Friday, 24 May 1957?).
Lower Left: 100 size (small pistol), brass cup, domed, two-leg anvil, transparent red lacquer over anvil and composition, dark-colored wood tray, lot number AL-85/22/1 (?Wednesday, 22 January 1958?).
Not included/photo on another site: 100 size, appear to be brass cup, domed; dark-colored wood tray, lot number AL-85/1/8 (?Friday, 1 August 1958?).
Lower Right: 210 size (large rifle), empty box, black plastic tray, lot number AL36157 (?Julian date 157/Wednesday, 6 June 1963?).
I think the first two digits in the lot numbers are the year reversed: 25=52, 75=57, 85=58, and 36=63. The divided-into-three-fields lot numbers are probably year/day/month. If the box with black plastic tray lot number’s 157 was day/month it would be Sunday, 15 July, and I don’t think they were working Sunday’s in 1963. But they were working on Julian date 157/Wednesday, 6 June.
Of course if somebody had early Federal primer boxes with divided-into-three-fields lot numbers with the last field of 10, 11, or 12 – but not higher; or better yet, with the second field of 30 or 31 – but not higher; that would pretty much prove those dates in the 1950’s.