Originally Posted by Geoff Roznak
Originally Posted by Argo44
Looks like original London proofs might be 1887-1896:

[Linked Image from jpgbox.com]

I really appreciate the step by step on that.

I didn't expect it to be that old with the 2 3/4" chambers.
it did not have 2 3/4" chambers when it was first proofed - the 12 over C in the diamond would have been marked 12 over LC, indicating long chamber.

"it's a poor sort of memory that only works backwards."
lewis carroll, Alice in Wonderland