Trev:

I saw that and it may be an additional stamp but I now see it on your standing breech pic and it looks to be something akin to XXXXXX-77 on the data string( confirming the 1977 date), which was where the date was post 1900. Apparently they also stamped the date above the obligatory smokeless powder proofmark, which may have been a condition post 1972. They may have been paralling the German configuration less the month. What is the initial on the forend lug? Is it a 6 3/4 lb or 7 lb gun? Also I failed to mention that it has the Anson pushrod type forend typical on a Belgian double.

Kind Regards,

Raimey
rse