Much thanks to Firebird, Smithman, JSR, and Automatic. Sorry if I left anyone out. That was ALL great info. It has cleared up allot about this 39.

I suspected that it was a pretty unique find, but now I'm really excited. The collector bug has bit me. I will get this 39 lettered very soon. As best I can determine, I have a pre-39 slide and frame with a 39 safety lever, left grip panel and model number mark. I wonder how many other 39s are out there with this mix of Pre-39 and model 39 features? As Automatic pointed out these mix and match models may be rarer than actual full Pre-39s and regular 39s. Or am I just too excited?