I had this piece looked at many years ago and was told it’s a white gold case with about 60 diamonds going around it. It has ruby jewels inside.
Approximately 2” round
Tissot - A Gentleman's 18ct White Gold & Diamond Pocket Watch, Swiss 1950's
the cream satin dial with gold Arabic numerals, with subsidiary dial, hand deficient, the edge set with 60 small 8/8-cut diamonds, 16 ruby lever movement, 50mm in diameter.