The 760 was produced 1952-1981, the 7600 was introduced in 1982 and is still in production, the Model 6 was introduced in 1981 and produced 1987. All three models look vaguely similar, but there are some differences. Do you remember what the wood looked like? The 760 had either smooth wood or that really awful reverse diamond stamped checkering, the 7600 and Model 6 had machine cut checkering or rolled basketweave checkering. There was also the Sportsman 76, a basic, no-frills version of the 7600 with stained birch stocks and matte bluing on the metal.
Model 7600