No letter suffix?
 

Gun is a 42 1940 and I just noticed there is no letter suffix on the frame, under the bbl or anywhere I can see. Finish looks original for sure. Vet bring back, numbers all match. Any idea why?

It could be a replacement frame, but I would expect see evidence for that on the trigger bar.
So it's probably from between 'z' and the new beginning of 'a' serie. Don't have any books where I am right now, perhaps someone can look up on 1940 Mauser serial ranges?

Hi Phatrick, the 1940 Military Mauser Lugers serial numbers started around 5000z and continued. After the Z-Block, the next serial numbers 1 to 9999 had no suffix. If yours is all matching, it is one of these Lugers.

Congratulations!

Sweet.... was holding my breath for a minute. Now tell me that adds to its rarity or collectibility and i'll be extra happy.

Sorry, you will just have to be happy. No rarity there! If there is such a Luger it's a common run of the mill. BUT IT"S STILL A LUGER!!!! :)