Ref. 9420, Chrono Time.Tudor, Automatic - Chrono Time, Ref. 9420, case made by Rolex, Geneva. Made in the 1980s..Fine, self-winding, water resistant to 100 meters, stainless steel wristwatch with round button chronograph.registers, tachometer, date and a
C. Three-body, polished and brushed, screwed-down engraved case back, steel bezel with gray insert and tachometer.graduation to 500 UPH, Triplock winding crown protected by the crown guard, crystal with Cyclops lens. D. Two-tone.anthracite and red with applied steel baton indexes and luminous dots, outer 1/5th seconds scale with 5.minute/second red Arabic markers, subsidiary dials for the seconds, the 30-minute and 12-hour registers, aperture for.the date. Luminous black baton hands. M. Cal. T 7750, rhodium-plated, fausses cotes decoration, 25 jewels, straightline.lever escapement, monometallic balance, shock absorber, self-compensating flat balance spring, micrometer.regulator..Dial, case and movement signed..Diam. 40 mm. Thickness 14 mm.