20MM M18A3 steel dummy rounds in sealed cans and open crate

[audiophil2]

Picked this up a few days ago while rummaging for old crates.
Unfortunately a previous customer only wanted to by 1 dummy round so the missing can was opened and all but the 2 displayed were sold. Can was tossed.
Seller told me it is 1950's era.

Anyone know anything about these?

[smle-man]

Function testing and drill rounds for 20mm autoloading cannon both ground mount and aircraft guns.

[edgerly779]

Sell hem to studio prop shop. Try stenbridge guns.

[Funbaby]

Dang , shiny; bet you could get a few bucks for those in flea bay.