Andrew Nethercott Antiques has dated this Art Deco Cocktail Watch to the 1930s.
The solid 18 carat white gold case set with 26 small old cut diamonds
The case hallmarked 18K with the head of Helvetia (Swiss mark for solid 18 carat gold)

Fine hand engraved sides, built in fixed bars for 9mm strap.
High quality 16 jewel movement marked Ch F. Tissot & Fils
Winds fully, sets and runs well keeping good time.
watch head weight 11.1 grams
case 13.5mm across, excluding the steel winding crown x 34mm long

All in excellent condition with no significant wear, the dial with some darker patches
The back engraved 'John to his Sunshine Vera'
Not waterproof or shockproof, fine for occasional use or to collect.
With new old stock, fitted black nylon fabric 9mm one piece strap with white metal buckle,
or fitted brown lizard skin strap with white metal buckle.
With fine period faux tortoiseshell papered presentation case.
Andrew Nethercott Antiques has dated this Art Deco Cocktail Watch to the 1930s.
Works of art, collectables, scientific and decorative antiques from the 17th - 20th century
You can view the stock and full dealer information on the Andrew Nethercott Antiques Profile Page