... in a private collection (sadly not mine).
Enjoy the dismantled mechanism shown here for study for the very first time ever - that should enable you to rebuild it, Richard!
The brass inlay is quite common to the period; though not marked, this beautiful little gun was certainly made in South Germany, probably Augsburg or Nuremberg. The open back sight tunnel is quite unusual and somewhat contradictive to the basical function of a tubular back sight: to narrow the focus ...
The stock varnish is a greenish now turned dark color, the ramrod a poor replacement.
Michael