StevefromPA - I bought the car from the Flynn's when they were selling a lot of their New Marx prototype cars back in 2008. Here's what they had to say about that car.
"Marx O-gauge tin lithographed car new, unused from Marx Trains archives collection. Production sample 7603 Line Mar power car, made 1999 for Y2K set. Unsure if mistake or mockup as it has orange 7691 doors instead of Y2K & has gold bullion inside instead of generator. Who knows, with the price of utilities these days maybe it was a premonition of things to come!$$$$"
The car has some markings on the underside as well.
