Case material: Steel; Charge: Manual; Conditions: Used Year : 1960; Presentation condition : With dealer guarantee ; Price on request Gmtbroker Reference: 191701/130 A Stainless Steel Airflight Jump Hour Gents Wristwatch, silver dial with jump hour apertures from 1 0'clock to 12 0'clock displaying arabic numbers, a stainless steel fixed polished bezel, a brand new brown leather strap with a stainless steel pin buckle (both not by Gruen), plastic glass, manual wind movement, in excellent condition, comes with a presentation box, our own certificate of authenticity and our own one year warranty. N.B.This watch features jump hour apertures from 1 0'clock to 12 0'clock. As the time reaches 1pm, the display jumps to a 24 hour format and back to a 12 hour format at 1am.