platinum bracelet with diamonds and sapphire

An art deco platinum bracelet with flat platinum links that connect to 14 half round links alternately set with three sapphires (21 sapphires in total weighing app. 4.41 crt) and three diamonds.  (21 diamonds weighing app. 1.47 crt), with an invisible lock with the master mark for: J & L Hartzberg, America, New York, circa 1930.

weight: 29.46 g
length: 17 cm fits a wrist size of 14-16 cm
dimensions links: 10 x 5 x 4 mm