Yes, and your wife found a jewel for you. It was the club's "Members Only" knife for 1992. Each year the Buck Collectors Club and Buck come up with a special offering for Club members only. The put the BCCI banner and the year on one side and the club members number on the other side, such as XXXX/500. Some have thought that it was a serial number but that's not the case. Some did get sold with no numbers on them.
The 535 was called the Bucklock-2, introduced in 1991 and was dropped from the catalog in 1995.
Great Fathers Day gift!