Argo44:

The »T« to which you refer looks to be »JF« or similar. Also the initials „EW“ just may note effort by a Belgian tube mechanic. I am not positive of the Birmingham Tube Makers' last names, so „EW“ could well be British. But there was an exception in the Belgian Proof Law where a barrel or platform could be sent to another Proof Facility without passing Belgian Proof.


Hochachtungsvoll,

Raimey
rse