A collector's special find, the 1950's Explorer automatic winding time zone design from Hamilton: the inner dial, with a two-tone outline map of the continental United States and the United Kingdom initialed with the five zones: Eastern, Central, Continental, Pacific and Greenwich Mean Time, with arrow markers indicating the correct hour for each. The outer dial is stationary with applied gold hour markers and numbers, waterproof snapback case, back engraving. Dial is original, watch is in very good condition.