It is a specific model of the one on the Auburn and Allentown. I think PRR had 2-3 more like this one.
I have one and the drive seems fine for home layout use. I have not run mine a lot maybe a few hours tota. It seems like it is just starting to break in. If run for hours and hours at a tiime on a club layout, it might wear out as do most drives.
NJCB also imported a model of this same doodlebug. I think the details on the NJCB are sharper and finer. But they are are also more fragile and prone to cold solder joints (they fall off). I had one of these before the SS and I became frustrated with doing constant little repairs.
The details on the SS seem a little cruder maybe but not noticeable unless side by side.
As for price, I don't know. I guess one at a show would be asking about 500 maybe more. I think new when they came in they listed at about 600 or a little less. You don't see too many for sale at shows, so I guess they would hold their price pretty well.
It is a brass model, not plastic so was probably a pretty small run.