This information is no substitute for obtaining a Winchester Factory Letter from the Cody Firearms Museum (available for certain models and serial ranges) which in addition to the Serial Number Application Date, normally provide the original Received In Warehouse Date and Date Shipped from Winchester factory.
For purposes of determining if your gun is legally considered an “antique” (pre-1899 DOM), the BATF has told us they use the DOM dates published by the manufacture (Winchester).
An older weapon with matching serial numbers throughout will be more valuable than firearm rebuilt with parts from different firearms. You can find the year a Winchester rifle was made by doing a database search free on the Internet.
The Winchester Model 70 is a bolt-action sporting rifle.