What it worth????

Are you positive the one you are looking at isn't a reproduction? Every reproduction one I saw had no decals and all but one used one had decals but you could see scratches on it.

I did an eBay search and found one nice used one at $512.05 with the complete decals and plenty of plain cover reproduction units without the decals for $325 new. The $512.05 has had 4 offers and hasn't sold.
In the completed auctions there was a used one for $285.00 and no decals but it didn't make reserve. Another one sold for US $315.99 and it had decals. The most expensive one brought $450.00 and once again it had the decals.