If indeed it was made by Micheal Pegam, I'd guess he was active up at least to the 1970s. I really don't have any info but I'll check and there are some Pegam but they may not be gunmakers. I was thinking there was a Joseph but it was Jackob Pegam who was a gunmaker.

There must have been another set of tubes with the right tube being rifled.

For those like me who don't know exacty the location of the city:
http://en.wikipedia.org/wiki/P%C5%99%C3%ADbram

At the time of this example Adler's location was purely a firearms merchant's location because he could have taken the example to Ferlach to experience proof but why if he was so close to Prague. There may have been other craftsmen there but it pailed in comparision to Ferlach, Prague & Weipert gunmaking centres. There was an Alderwaffenwerke in Zella Saint Blasii in the early 1900s but it was owned by Max Hermsdorff and/or Paul Haeussler.

Kind Regards,

Raimey
rse