I've had similar experiences in some of the "antique"/resale shops. A couple of years back, I was browsing through the various displays, and ran across the usual "antique" Starflashes, Starflexes, Ansco's, etc. Consignors were evidently dreaming when they priced things. One small display cabinet had a light meter, which I recognized as a Soligor 1deg Digital Spot. When I opened the case, it was tagged with the Zone VI stripe on the lens. I asked the manager if the seller would deal (asking price was $70), and he took $10 off immediately. The meter seemed to work all right, since I tested it @ 100 ISO, and got the appropriate "Sunny f/16" EV response. I figured for $60, no harm, no foul.
I got it home and tested it against my 1deg Pentax Digital Zone VI conversion, and the two tested identical (i.e. less than 1/3 EV against my Kodak 18% gray card. Since then I've used it a number of times with my Hasselblad and 4x5's, and have always gotten great results.