Do you know what those words mean?

I like this guy on Gun Broker asking big money for a "PINNED AND RECESSED" Smith & Wesson Model 940 that clearly does not have a pinned barrel, nor ever did any 940 have recessed chambers. Plus the gun has a clearly visible 7-digit alphanumeric serial number with a "BKR" prefix that dates to the early Nineties, a decade after any pinned-barrel Smith left the factory.

What do people like this even think "pinned & recessed" means these days? Are they just using it as shorthand for "I think it's old?"