I know this is a zombie thread, but Herb mentioned his rifle on another forum where the idea of starting an informal database on these rifles was raised.

From the dozen and a half examples to date(including my own), the highest serial number is in the 6500 neighborhood.

Would anyone else have one of these tucked away?

Quick & dirty of my three-digit, temporarily fitted with a reproduction 20 round trench magazine prior to taking it out to the range for a function check.