The 1937 Omega Naïad
Omega's first "standard" waterproof wristwatch was the 1937 Naïad. In Greek Mythology Naïads were nymphs who lived in and presided over brooks, springs, and fountains. The Omega Naïad had a snap on waterproof case back and a waterproof crown that sealed against the stem tube on the side of the case. .

The case back carries the words "Waterproof" and "Mod. Depose", which means "Registered Design". The crown is quite slim and unlike the later model Naïad crowns described below, but must use a similar sealing method against the stem tube to make the watch waterproof.
The movement is an Omega 23.4SC. This manual wound 15 jewel Omega movement runs at 18,000 vibrations per hour (vph). has a bimetallic compensation balance and Breguet hairspring. The 23.4SC movement is 23.4mm diameter, and the SC designation shows that it has a centre seconds, which in this movement is driven indirectly. The calibre 23.4 was a great success for Omega. Designed in 1935 and introduced in 1936, the 23.4 was the first Omega calibre with centre sweep seconds. Used in the Omega Medicus, it was manufactured until 1953.

Rarely available for the late 30s, and in very good condition! Dimensions 31mm without crown. 33mm with. Rare Modèle Déposé Waterproof.
Nicely aged patina dial. Watch is guaranteed 100% authentic and original! Stepped case also a rarity these days! $799 Shipped. Selling Watch head and light green strap only.