Dayle is correct - it is the Singer 99 of the 1950's. It is very heavy, but sews a great straight stitch. I paid $20 for mine, though I see them listed on ebay for a whole lot more, plus shipping. I think anything less than $75 for one in good to excellent condition is fair, but you can get one for a whole lot less. Also, Billy said the case/cover is not super durable, so finding one with the factory case intact is a plus.
Darren