Sandi, Jan C. Still has written several books on Lugers, one of which is "Third Reich Lugers", which is what Dwight is quoting.
There are other Luger "Nuts" that claim to have 1938 data down to 6000 with a no suffix. These have not been documented and could be erroneous.
Still's book is only approximate, but it seems that a no suffix 1938 is probably too low a serial number to be legit.
Still, pardon the pun, a photo is worth a thousand words.
While a noble cause, you might be chasing a ghost!
Good Luck
