[railwayguns, armoured trains and Military Railways] eBay May 03, 2016
Thanks for pointing me to the “completed” and “sold” options. Here’s some more info (mostly from Mark Berhow’s “American Seacoast Defenses”):
351692851141 -- old wall breaker cannon, 24 inch? Russian?
It’s the Russian Tsar Cannon, 89 cm (35.0 inches), preserved in the Kremlin
322085318839 -- 1910c USA Coast Artillery pointed shell on trolley. ( 8 inch? )
Taking the soldier’s head as 8 inches, this is probably a 12-inch shell.
361541513541 -- 1910c USA Coast Artillery Open Cannon Breach Block.
322085316557 -- 1920c USA Coast Artillery Ramming shell.
These both look like the 12-inch gun M1895 on M1917 long-range barbette carriage, the ramming picture definitely is. Quad recoil cylinders were pretty much only found on this gun and on the railway mounting for the 8-inch gun M1888.
351704255554 -- 1930s USA Coast Artillery large cannon. 10 or 12 inch?
It’s the 12-inch gun M1888 on barbette carriage M1892, based on the loading platform support. The shell has an early form of armor-piercing cap. The disappearing carriage for the 12-inch gun took longer than expected in development, so a number of these (about 32 including “altered gun lift” variants) were deployed on barbette carriages. Nine each 10-inch and 8-inch guns were also deployed on this type of carriage for the same reason; four of the 10-inchers were lend-leased to Canada in WW2, where two still exist on McNutt’s Island, Nova Scotia.
351718930549 -- 1941 Finland artillery inspection. (40 mm ?).
Definitely looks like the good old 40 mm Bofors.
281942048796 -- WW2 US HT M15A1 view of 37 mm AA gun
This is the M15 Combination Gun Motor Carriage, with 1 x 37 mm and 2 x .50 cal guns. The barrel has been removed from the right-hand .50 cal gun.
391429911410 -- 1945 Japanese gun Okinawa.
This looks like a Vickers-designed 6”/50 caliber naval gun. http://www.navweaps.com/Weapons/WNJAP_6-50_t41.htm Known as Mark M, Japanese Marks II and III, or 15 cm/50 41st Year Type.