According to the Archives of Tag Heuer the present watch was made in circa 1971.
The Heuer "Monaco" was designed by Jack Heuer and named after the celebrated Formula One race track. It was introduced simultaneously in Geneva and New York in 1969. The very first series was fitted with a calibre 11 self-winding movement and a metallic blue dial with white registers. The Monaco was the first square-cased and water resistant chronograph.
Very soon after its launch, a version with the improved calibre 12 was released, as rare as its predecessor. Also nick-named "McQueen Monaco", it became synonymous with Steve McQueen when he wore it in his 1971 film, Le Mans.