Insignificant point. The Brits get wild when we mention "water table". It makes sense as that is used in ship building and aeroplanes as a reference point. But the Brits insist that only "table" is proper. Evidently, "water table" likely started as a magazine writer's miscue. My Brit friends suggest around 1950, but I have seen it a couple decades earlier.

In any event, very nice gun you have there.