Here's a newer one, made in 1970. Knife is a 6488 "Big Congress" This knife is called a transition because it has one blade stamped ten dot (1970) the the other blade is stamped CASE XX USA which is a stamp used from 1965 through 1969. They a considered rare and command a higher price. The '88 pattern is the most sought after Case knife by collectors. It also has the current record for highest price ever brought for a Case knife. One was sold at an auction for $14,300.00.

Here's a picture of the transition knife that I used to own.