My very first gun was a Cooey; still have it. A lot were imported into the U.K. in the 50's and 60's. Only ever saw them in 12 bore or .410 and the action size to those was the same. The breech end of the .410 barrel was very thick with an abrupt taper in order to fit.

I've often looked for an original Winchester 37 here but have never come across one. Loads of Cooeys, Harrington & Richardsons and savage singles but no Winchesters. Lagopus.....