Herr Walther -
Thanks for replying, I wish I had better pics but this is all I have for now. In the future I will get some better ones and post them. Unfortunately I was on a trip when I saw these and won't be back to see them until the holidays.
I posted these on the P38 forum as well, and have done some more research on my own, and believe that the black-gripped gun is a "byf 42" or "byf 43", manufactured by Mauser. However, the slide and frame numbers do not appear to match - 5346 vs. 5826 (hard to tell for sure). The 5XXX serial number appears to make it a 1943 gun, but the date on the slide sure appears to be 42.
Question - If the slide and frame numbers do not match, how much does that affect the value? Is 50% too much of a penalty? I realize it becomes a shooter at that time, I'm just looking for a fair number to offer.
The other may be a "cyq" manufactured by Spreewerk. That one does appear to have matching frame and slide numbers (again, hard to tell).
I wish I would have known more about what to look for when I had my hands on these, next time I see them I will for sure.