The early watches were not marked with the family name. That refers more to the watch being waterproof with a screw down back.
I have been looking for a case for a caliber 351. I have two watches which are 344. The date at 6 is usually 353.
The more one works with these watches from the 1940s and 1950s can one see the subtle variations. Especially the dials.
Before the 1970s and the quartz crisis movements were sold as a commodity. The concept of Intellectual property was not as strong. Companies relied more on reputation and customer service. As others said, the Tariffs were high (to protect the so called domestic industry.) There was also a huge service industry to keep things in repair.
With the advent of transistor radios, calculators and cheap watches, all this stuff became disposable.
What most collectors look for is condition. What may appeal to one may not appeal to another.
You have a nice watch and a family heirloom. The value is in having it serviced to wear and enjoy.
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