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Bourgeaud estimates that Piaget produced 2,000 to 3,000 of the square and the round Polo (i.e., 4,000–6,000 in total). It's a link surprisingly small production number, though perhaps not as much when you consider the MSRP and the fact that you could've gotten link a gold Rolex link Day-Date for about half the price.

The Heritage 1938 asserts an interesting period in Longines' long history with the military. The original watch was released between the link emergence of the Lindbergh Hour Angle and Longines' contribution to the famous MoD "Dirty Dozen" watches. Even during the interwar period the link manufacture was still pumping out designs link that would become a useful tool for soldiers on the battlefield.