If no other data was available, where did the 6/45 date come from? If the 6/45 comes from a date on the negative, it would be the processing date if printed on the end of strip tag, or the film manufacturing date if on the side sprocket. Jerry Day would probably have a better say for that era. If it was a processing date, most people I know used to keep an occasionally used camera with the current roll of film in it until fully exposed and it sometimes took a few months to use up a whole roll, depending on how active a photographer one was. So the photo could have been taken much later if it's the manufacture date. If it was the film manufacture date, that means the pic wasn't taken until at least June of 45. It does look like a spring photo judging by the vegetation and the angle/length of the pole shadow (taken right around noon I'd say). With that test date in Alamosa the car couldn't have gotten to Chama and been placed and isolated like that before June (and it looks like it's at least wintered in that position to me), when there would have been at least a fair amount of vegetation sprouting up. I say it's at least spring of 46.