Hello Tantomurata,

Thank you for your response.
Yes, you are correct; it is about 0.6" and smoothbore.
I didn't realise that it could be a conversion until you mentioned it, very interesting.

I had looked for a makers mark but the closest that I could find to anything resembling that was shown in the last photo; but it really is impossible to read from any angle.

In case it's not clear, all the metal work appears to be iron, I can't find any brass; The barrel is 6 3/4".

Ok, so now I'm looking on Google for Prussian Flintlock or Prussian Percussion Cap Conversion pistol; that gives me something to go on.

Thanks.

0liver