I haven't got access to my K98k library, but I wouldn't worry too much about the serial number thing, as this type of information keeps changing.
As Steve said, 40 is barrel date ...
Almost have a complete Oberndorf collection from 1934 thru 1945...
Post pics !!!!!
Regards,
Badger
Very nice. I would like to add a nice condition all matching K98 to my collection, but finding one that nice at a reasonable price is not an easy task! Thanks for sharing.