Vickers 47 mm export tank gun for Poland?

[Tony Williams]

Somewhere on this site (but hiding from me) is a mention of an interwar Vickers 47mm tank gun supplied to Poland (probably fitted to a tank, I can't recall). This was not the same as the 3 pdr used in the British Army's Vickers Medium tank, as the cartridge case was smaller: 186 mm long with a 56mm rim.

I notice that the rim diameter is about the same as that of the well-known and widely-exported Austrian Böhler, which came in various case lengths.

Could the Vickers gun have been designed around Böhler ammunition - or perhaps an entire Böhler gun was mounted in a Vickers tank?

 

[Tony Williams]

It looks as if this might have been the tank: https://en.wikipedia.org/wiki/Vickers_6-Ton