Hex Gettysburg is the 1961 version of Gettysburg published by Avalon Hill. The square grid and movement templates from the 1958 version are gone. Gone also are the rectangular unit counters. Instead, players have a classic hex grid, along with normal square unit counters. This version was panned badly and did not survive in the AH catalog for long. The square movement grid was returned in the 1964 version of Gettysburg.

This description courtesy of user Soltan Gris.