I just took it apart and looked...the underside of the barrel has no marking, save for a small index mark dead centerr of the bottom where the barrel meets the reciever. Mine has an aluminum buttplate that is black. The museum in Cody doesn't appear to have records for model 70 made this late. It appears there was a fire in the late 50's, and a lot of the records were destroyed in it. I guess I'll never know.