Looks like an early model round ram but the head looks strange to me, and might not be a Bport head at all. It has a large flat surface on the left side in that pic that Ive never seen on any M head nor J head, and the ram adapter seems overly long. Got any other pics so I can see what it is?
Assuming the head checks out, it still looks like it needs lots of love. Dont get down, bc paint doesnt relate to accuracy, but Ive found it does relate to abuse quite often. Unfortunately, I cant pass along suckage as others have done. At least in the midwest & northeast, thats what theyre worth unless its MINT. I spent $250 for mine from 1952, and it was a functional machine with the more powerful/newer J head, a ton of new parts, decent paint, and very similar tooling. On this one at that price, I would be on the fence but leaning towards passing unless the ways have fairly fresh scraping, and Ive been to this rodeo a time or three already, and you can get newer/nicer/more powerful Bports for $2-300 more.
Dont get me wrong, the smaller/older Bports are nice but not really valuable to any professional. Definitely nice for small garage projects and theyre light, easy to move, and doesnt take up a ton of room. Not the biggest on power with the original M heads, only 1/2 hp, but theyre still capable of good work assuming you have lots of time. Dont be mistaken, that machine will not move the metal of a newer machine, so keep that in mind as you read online.