There were SEVEN versions of the Minolta SR-1. Since you have one with a meter holder without a plastic tip on the film advance lever you have either the fourth or fifth iteration. If there is a mark next to the shutter speed dial -- "LV" -- you have a Model D. Otherwise, it's a Model E. Also on the Model D the film counter window is round and on the left-hand end of the camera, while on the Model E, it is rectangular and on the right. The other way to tell is that the Model D has the motor drive connections on the bottom, the Model E does not.
The Rokkor-TC 135mm f4 actually came in two versions. You have one, but Minolta also used it for its first Bellows lens simply by removing the focusing tube -- and adding a Leica screwmount instead of the SR bayonet.