So, this one's price is still 2x higher than a brand new Norinco Tokarev.
It is a transitional variation between Bolo and M1930, can be classified as M1929. The factory had no specific designation for it, just another 'Zenhlader-Pistole', but a 'Neues Modell' (new model), a salt blued gun, made only in that year. Contrary to common believe, M1930's signature change was not the 132mm barrel, the signature change was the universal safety lever. M1929 New Model had 132mm barrel as well. Looks like most of these were exported to Nationalist China, this one should be an instance. Some instances even carry Shanghai Police property engraving. Fewer instances were sold in the Western. So it was scarce in the U.S. until 1980s.
If it works, no need to work on it. Not only save $$, but also preventing the possibility of turning a reliable gun into a unreliable one, IMO.
M1929:
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