This is a "double zero" cyq.  This example has the original finish (was not dipped) but has an import marking on the frame tang.  This is a rare example of a very late production gun.  Notice the U's and no Spreewerk inspection stamps (waffenamts).  The locking block is blued and the method for applying the serial number is interesting.  The mag catch has an E/359 waffenamt.  The highest known serial number for this variation is 00100.