Quote:
I have used a Purdey second model thumbhole as my grouse gun for a number of years.

Wish I could say the same!
The thumb-hole Purdeys are not common in Australia, most of the Purdeys I have seen in recent years were Pigeon-guns, although sidelock game-guns were abundant before our currency crash a decade or so back.

It wouldn't happen to be an ejector, by slim chance? I would have to say that a Purdey or Boss hammer ejector would be my idea of the Holy Grail!