Dear Mr **,
The hammerhead is a valid responsibility mark belonging to the USH-APIC (see attachment) which is an association of the Swiss Watchcases Manufacturers.
In 1934, the USH-APIC gave the authorisation to the company Gindraux SA (watchcase maufacturer) to use the number 119; in August 1972, the hammerhead No 119 has been cancelled on demand of USH-APIC, perhaps because Gindraux SA did'nt exist any more. We don't know exactly the reason.
I hope that my informations can be helpful for you or for the history of your watch.
Head of the administrative services
Federal Department of Finance FDF
Federal Customs Administration FCA
Central office for precious metals control