That looks like any number of Asian mills from the 70s & 80s that were patterned along the lines of the Clausing 8520. Select was one brand that I recall. It's worth what you're willing to pay. I am not willing to pay anything, since I have mills already and don't need another. If I was 30 years younger and wanted a starter mill for my home shop, I might give a few hundred in today's dollars.