Hi I think mine is a turkish built gun though I couldn't see any difference when put side by side with a brum built one except birmingham stamped on the brum one.
it says Webley & scott TR HT 070710327 on the side .
Do they all have 27.6mm piston seals ? mine has a nasty nick in it I measured it and it came in at more like 27.1 but that could be my measurement skills it also has a purple one in at the moment .