Zenith Stellina Chronomètre Jumbo caliber 135 Full Set 1960's for $8,527 for sale from a Trusted Seller on Chrono24
Zenith, Kari Voutilainen and Phillips Join Forces to Revive a Historical Chronometer Movement (With Live Photos) | WatchTime - USA's No.1 Watch Magazine
Case study about the Chronometer - the Zenith Calibre 135 - Monochrome Watches