Brian B:
Your mailbox is full. Please clear some space old chap!
I have a 1931 Trials No 4 T SN A 1989 that was F.T.R.'d and is stamped "F.T.R." and "TR" in the same places your 1931 Trials No 4 T SN A 1582 was. Does yours have the "T" stamp on the left side of the receiver where later No. 4 rifles had their make. model and year marked?