Introduced in 1958 to replace the Autavia, the Monte Carlo features a 12-hour numerical counter in a “window” at the bottom of the dial. Heuer proudly announced that the new central register (for seconds) and jumping disc (for hours) assured the "greatest legibility ever found in a stopwatch". Three-button models sold through 1967 used a button to advance or reset the hour disc; two-button models used a single button to reset hours, minutes and seconds. Paired with a Master Time on a double back-plate, the Monte Carlo was one-half of the classic Rally-Master pair.
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For information about the relative values of the Monte Carlos, go to Monte Carlo on our Values page.