Hi,
It's a model 54 Match rifle. Grauhanen is right about the proof markings. And as well, the two digit yr of mfg would be below the rear sight block; its missing. There would be other manufacture markings further down the barrel to indicate it is an Anschutz 54 Match rifle. Looks like other manufacture or barrel turned down?? And the breeching nut is missing. I have what appears to be an identical rifle and in similar serial range; mine is lower and a 1971. It is a model 1408 54 Match rifle. I bought it new in 1972 and still have it. Although it has been professionally customized to meet SFC Sporter rules. Looks a lot different now. And the barrel length is 26 inches. Can't get a close view of the trigger, but looks different from mine. The 1408 came with a standard curved trigger. Hope this helps.