1970's Zenith Diver Reference A3637 is a very rare vintage diver's watch. The watch works with Zenith's own Cal. 2542PC automatic movement. It keeps signed crown and original Zenith signed "Gay Freres" bracelet band. It is very hard to find one with a bracelet band. →Engraved numbers: "06803911" on movement and "221D903" on caseback. →The case is very big for its era: 43mm (excluding the crown) x 50mm (lug-to-lug) →Original bracelet band fits up to 20.5 wrist size. Lug width is 18.5 mm →The watch has minor signs of use on case and back. Dial has tiny marks and looks very good for its age. Crystal glass has visible scratches. I didn't try to clean it, looks authentic. 2 matched links near buckle were added to bracelet band professionally to extend band's length. The movement works well. Please look at photos carefully for exact condition. →No box & paper. The watch will be shipped via Express Courier to worldwide with a tracking code. Delivery time is only a few days* for Europe and approx. 5-7 days* for other countries. Please, be aware of customs duty. Customs duties are the buyer's responsibility and beyond the control of sellers. *Estimated business day