This could be the first generation Defy (?). It has a slimmer case, thinner glass, less angular case and the 21800 beating caliber 2552 PC automatic movement. A rugged 37mm all steel Zenith diver, ca 1969, certified for 300m! The lume on the hands and brown/green dial has aged beautifully. This watch is fully serviced and ready for many years use. Signed and numbered on the movement serial 7107387, 23 jewels. On inside back cover: “ZENITH Swiss Made Acier Inoxydable Patent Pending 1808 -68 Modele depose”. This is in our opinion the best looking Defy model. It will both last and increase in value!