Congratulations on a great rifle. I really like the screw grip action and have two DRs using it (a 360 and a 500, both BPE.)
Do you know when it was made (before the date on the stock)?
Would you see if the forearm lug has a number stamped on it? Both my DRs do, as does a screw grip DR converted to a shotgun (2x Army Navy CSL and 1x Watson Bros).