I recently purchased a PPQ M1 in 9mm. The one thing I noticed about it was that the makers mark, date code and serial number on the side of the slide are barely noticeable. You have to tip the slide just right in the sun light or under a very bright light to see it other wise it is not visible. I would like to know if anyone could shed light on this anomaly. Oh! It was built in DE (Germany), 2011 Ser # FAJ XXXX.