Case material: Steel; Charge: Automatic; Conditions: New Year : 1980; Presentation condition : With dealer guarantee ; Price on request Gmtbroker Reference: nessuna Chrono "Big Block" 9420/0 bakélite - Full steel, case by Rolex, "automatic - chrono time" dial black with white counters, bakelite bezel, screw pushers, date, automatic movement Valjoux 7750 caliber. First automatic chrono sold by Rolex !