I picked this up recently despite knowing nothing about it, because it was way too interesting not to. All mismatched, and it has no special markings that I can find. Fits a fairly modern Czech 26.5mm flare just fine (my Chobert Gras conversion requires a slightly narrower rim diameter than the Czech flares). There is a hole bored in the stub of the stock; not sure why. Does anybody know anything about these? All I can find it that it is vaguely similar to a German conversion documented in Huon & Barrellier's Lebel book. If anyone has any information on these, I would be very interested!