Well , it is an early and rare gun . It has been drilled for a scope and I think the stock has been replaced or has been checkered and buttplate replaced. These changes would destroy the collectors value . Herschel is the go-to expert on these to be sure , just to be sure it's not a variation I'm not aware of . You have a well made and prob'ly accurate rifle. Take it out and have fun , I do with my minty M2 and others.
Chris
PS
Most were not drilled on the reciever ring , a few were. Early ones had groved forends , yours may or may not be early. Smooth forends were later production , but don't know cutoff range . No checkering that I'm aware of. Buttplate should be steel , your's looks to be a rubber pad , but I may be wrong . Bolt should be un-numbered and have dual firing pins in the face ( hits the rim twice ) .