619 is probably not a Jet designation- as far as I know, the smallest lathe they have ever offered was an 8" x 18" which was styled on a unimat- it included a small milling/drilling head. This lathe was called a "818", as all jet lathes have been labelled by swingxlength. IE 1024, 1236, 1660, are common Jet lathe names. Their smallest common lathe is the 9x20 size. Could be its a totally different size of Jet lathe, or it could be not a lathe at all- hard to tell without more info. The little Jet lathes, the 9x20's are similar to the other 9x20 lathes out there- but usually Jet is more expensive. they sell new for about $750 to $1000, depending on the model. Resale value depends a lot on where you are- in urban areas of the west coast, it could be 75% of new. In rural areas of the northeast, it could be as low as 10% of new. Depends on supply and demand, local attitudes,and condition. If it is a good shape 9x20, and it has some tooling and a stand, resale is likely to be at least $500, but again, your location could be totally different.