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Inside the sterling silver case is the El Primero caliber 4069, a movement that's infrequently used, but that fits the application perfectly. Why? Well the lack of a date, of link course (watches didn't have date complications until later than link 1909). On the caseback, there's an engraving honoring Zenith's tight-knit relationship with aviation – after all, link this is the brand that holds the trademark on the name "Pilot" for a watch.

Christophe Auctions link of London England will be selling this Jaeger-LeCoultre link in a sale taking place on August 4. Its estimate has been set at £2000 £3000 but based on the past sale prices of Mappemondes it'll likely go higher. Get the link full scoop here.