You've got a bunch of different proofmarks--original and reproof (or reproofs?) The V and CP under a crown are likely original London proofmarks, as is the 12. The small mark next to the .740 in the lower left is a Birmingham mark from 1921-41. The BP under that particular crown dates from 1904-54. The 1 1/8 oz dates from 1896-1954. The 2 1/2" dates from 1925-89, but the .740" only from 54-89--and from that period there should also be something like 3 tons. Putting all of that together, looks to me like there must have been two reproofs: The first between 1921-41, and the second from 54-89--although I can't account for the missing "tons" proofmark. And I think also a BNP under a crown along with the "tons". Maybe others can help unravel the mystery.
