The only Tilden I have is not marked except for 'fire' which would be forward position as any 3 position safety. I have never seen a Buehler style safety on a mod 70. Not even sure how that would work as it rotates vertically up and down. I do know it is possible to fit certain year mod 70 bolt shrouds to 1903 Springfields. It was one way to obtain a 3 position safety likely before people like Ed Lapour started making them. So the question that comes to mind can a Springfield bolt shroud be fit to a mod 70? Only conversion for a pre war is a Tilden AFAIK. Could be a one off gunsmith fabrication. A picture would help.