I made the call today to the owner. It is out on consignment and he will ring me tomorrow and let me know if it is still there.

It is a Lancaster O/U and is in .577, I do not know if that is .577 BPE or a shorter pistol version. It is hard to imagine a .577 BPE pistol but they were tougher then.

I will post more information as I get it

Regards