Small bore
The gun in the photo is a 12 bore shotgun - not a rifle. Unfortunatly the light was not good enough to get detailed photos of the proof marks - but they were original BP for a shotgun. The Maker was
P Webber of Bhm - of which we can find no record.
The hammers were as you see 'rebounding'. Now I could see the point of locking non rebounding hammers in the half cock position or - as in hammerless guns - possibley locking them in the cocked position - Oh I know most safeties only lock the triggers and not the hammers but you know what I mean. I think it would be as quick to cock the hammers as it would be to slide two safeties back - especially as they are set on opposite sides of the gun. I guess we will never know what Mr Webber had in mind?
John