I went back to my old emails that I had with Doug Knight on this gun from when I first (re) discovered it. His opinion was :
Quote:
This is the 2-pounder “David” high velocity experimental gun. Somebody must have plunked it on a standard 6-pounder carriage.........
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He finished the email with:
Quote:
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The muzzle brake is missing - interesting in that I have never seen the end of the barrel inside the brake - didn’t know it had a keyway.
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So, in Doug's learned opinion, this was one of the Davids, but now installed in a 6pdr carriage. Trials went on through to at least 1945, so possibly, when the 2 pounder system with 360 traverse was abandoned, they moved it to a more conventional carriage to continue to perform tests on that style ammunition. I'm not so sure this was gun no. EX54, in that the material Colin found talks about it being a 6 pdr barrel bored to only 40mm. This is not a 6pdr barrel.
Hopefully one day the gun will get a proper paintjob, at which time the EX number may come up.