By now, I've seen a number of Lugers with this bluing appearance. I am not sure why the normally deep bluing isn't present on these guns. Wrong surface preparation, solution temperature, chemical mixture, bath timing?
I posted pictures of my translucent blued 1939 (from the "r" block) when I first acquired it:
http://forum.lugerforum.com/showpost...36&postcount=3
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.