I have two British artillery primer tubes recovered from the bilge under the turret basket of a Chieftian Mark 7 tank. I have seen both of these sizes before but wonder why two distinctly different calibre tubes would be in the same tank. The Chieftian has a 12omm main gun and it is possible that the type of primer may have changed by a modification of the gun.
The second query is why does the slimmer primer have a case made in two parts, of different metals? In case it is not clear in the scans, the larger headstamp is: RG 67 L1A3 EW and the smaller headstamp is: XL4E2 RG 88 24