Made by Spain for the Brits in WWI. Quite a few of you are from Britian (or Uncle Bill) and might have more info on these. There does not appear to be much interest in these in the states but then they are not too common.
I think the Trocaola in the OP No2 Mk1. The other is Az..... is the OP No1 Mk1. Anyone know for sure or have more history on them?