Thank you Raimey, I don't have the weapon at the moment to check the dolls head well to check whether there are the initials. I keep it at my fathers place, although he insisted I take it, I don't want to as long as he is still here (I guess I'm just being superstitious and I want it to stay that way as long as possible)...

BTW, why do you ask about the Czech proof facility? I can visit them next week, I will be in Prague where they reside...

Do you have better picture of that drilling? The engraving looks very similar. Unfortunately, I was unable to google up what exactly is flash deflectors or side frame reinforcement... Shotgun flash reflectors only give me some photographer tools for deflecting flash... :-)