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Did you fully wind it or was it already fully wound? If it was already then it could be the mainspring, or it could be the balance staff, or both. Not to mention many other potential Robles’s but those are the usual suspects. I suggest you remove the movement and start making your checks.

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Its possible if it isn't old/gunked up with grease that you could get it going again by gently tapping the balance wheel with a needle or fine toothpick. If it feels blocked, don't push it. If that is the case it will need a disassembly and clean.

Ocassionally things jam up even in well serviced watches, so it could be that it just needs a 'kick'.
It is more likely that it is old and needs a service.

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If the watch will run at all, even for a few seconds it will usually  respond  to cleaning. Most likely  as previously  mentioned  it is dirt and fossilized lubricant. Of course  there could  be a mechanical  failure  as well. But this is less likely. 

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