My catalog has on it:
Agents: Irish Free State -- Thos. H. Henshaw & Co., Dublin.

I checked online and The Irish Free State existed 1922-1937. That's the only date range I can put on my catalog. Since it offers Damascus barrels, I tend to lean towards the early 20's for an age.

In the UK, 8 thou takes you out of proof. A cleanup from .729 to .732 would make the bores clean and not put the gun at a risk of reproof. Someone was looking out for the gun.

Joe