I have a Winchester Model 70 BARREL ONLY and the stock for it. Stamped on the bbl is "Winchester proof steel, - Model 70 -.30Gov't 06". On the bottom/underside of the bbl, just ahead of the threads is stamped, "1906" then looks like a triangle then the number 37 right next to an index mark. How do I determine if this bbl is Pre-64 or is this impossible? Thanks in advance. Blaster (Bob in So. CO)