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1. It has a lot of customized movement parts, such as hour wheel and automatic wheels, which are difficult to repair 2. The calendar zone is very long, usually can not be adjusted between 9 p.m. and 3 a.m., otherwise it is easy to damage the hour wheel. 3. The winding efficiency seems not to be low.

But it also has a lot of drawback.....

I'm looking through other books and try to find out.

I was reading an article on SJX recently, but some of the formulas in it confused me. Why does the amplitude appear in the formula for balance energy? Does anyone know how the formula for the balance energy is derived? The article mentioned the book The Theory Of Horology but I never find this formu

if the watch just need regular service, no need to replace parts, i think local watchmaker can do it for you.

may I ask where do you get the rubber strap?