cyq serial number 352i.  This example has as nice a finish as you would see on a Walther or Mauser made during the same timeframe, maybe better.  In the picture of the right side slide stampings you can see the very bottom of the E/88 stamp at the very top of the slide flat, above and to the left of the final E/88 stamp.  I can't explain that one!  Also notice the hardness test dimple on the right side of the slide near the front.  Also, the magazine that was in this gun is one of the best E/88 stamped examples that I have seen.  They are normally found well worn.