The absolute first-made serial number, IF TRUE, should make that worth a premium over the normal price, to a collector. If in good shape, maybe it's worth the $200 top figure that EW mentions, for that reason.
Anyone trying to sell something for that amount of money should put a lot more effort into the presentation. If the listing is real and the serial number is accurate, then he's stupid for not posting a good close-up pick of that serial number.
It may be a scam listing, or it may be someone who failed to find a good market value, hoping to cash in big-time with a uniquely low and desirable serial number, just plucking an optimistic price figure out of his imagination. Either way, I doubt he'll find anyone foollish enough to pay THAT much for it. If he'd put $1,995 instead, it might be thinkable that he'd find someone foolish enough to bite, and at $199 it's certainly thinkable, but nearly 20 grand, when some people here have bought this model for 1/1000th as much? "Fugeddaboutit!"