This is amongst my favourite watches I use to travel with due to its beautiful brightly glowing dial, easy readibility, and ruggedness. This watch has a quickset 24 hour GMT hand that makes it ideal for travel, keeping track of two time zones. This 1993 Bell & Ross by Sinn (dual name) highly sought after watch is known as the Space 2 ref. 144 with see-through sapphire case back displaying the (just cleaned) caliber 7750 Valjoux automatic winding movement. The 40mm. steel case looks fabulous (I took care of this watch) and the 6.25 inch bracelet will fit a small to medium wrist only. This watch has a screw-down winding crown to protect it from moisture (I regularly swam with it). As I say with all vintage watches, USE AT YOUR OWN RISK AND DISCRETION when swimming with a vintage watch. The sapphire crystal is without a mark. I’m sure you will love this watch as I did! This watch is hard to find.