Hi and welcome to the forum!
First off, a bit impressive to get that piece for 1$. If you're looking for a crown, I usually look at
http://www.ofrei.com/.
In this specific case, I wouldn't be so sure about not having to service it. These watches have been sitting there for a while and are more than likely needing of a service in order to function well. If you don't want to spend the money on a service, you can sell the watch for parts and use that money to get another piece.
Best,
Javi.
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