Here is my most recent arrival
Ultra Chron Chronometer (6651 movement) dated March 1975
Thanks to quick and efficent Longines' archive, I know that my watch has a terrible carbon accounting :
Saint Imier - New Zealand - Paris
Just back from my watchmaker, have a nos OEM crown set up - thanks to John Senior @obsoletewatchparts - otherwise running within the Cosc which is very impressive regarding its age 馃槑