Unfortunately it is not mine, and it belongs to a Polish collector. It is obviously cocked by direct pull, like a few other pistols of the period, but the barrel loading principal sets it apart from these. For example, the Simonon has a sliding barrel for loading:




The Eisenwerke Gaggenau TB pistol has a tip-up barrel,operated by a side button release:





and the extremely rare Langenhan (which admittedly does have a similar ring pull rather than T-bar pull) loads by rotating the barrel 90 degrees clockwise.




So it is certainly a puzzler.