We’ll call this one a guess
Buicks for 1947 and 1948 were, well, pretty much identical. There may have been mechanical updates and possibly an interior fabric design change, but for all intents and purposes, if you were looking at a ’47 and a ’48 parked side by side, you’d swear you were seeing double.
This car seems to be at some sort of show or display (girls looking through the side windows, woman sitting on the bumper, vehicle parked on a cement platform, etc.). And because it was presented like this then, I’m going to venture to say that this was a 1947 Buick Roadmaster and not a ’48. Why? Because it was the first time you’d see this 2-year design — had it been a 1948, it would have been difficult (based on the lack of design change) to convince the public that you had anything new to offer. It’s just a guess. Be it a ’47 or a ’48, one thing is for certain, in the day, “Wouldn’t you really rather have [had] a Buick?”