What Movement is This?

Hi guys. I just took this movement out of my mystery date Herma. Does anyone know who produced this and what the 87 means? I hope it doesn’t mean 1987 because the dial looks so much older than that.

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Is a Parrenin caliber 87.

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Is the same as the caliber 85.

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Ah! Thanks. Now comes the hunt for spare parts! Hope I haven't gotten in over my head.

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You want ranfft.org

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Billfrench

Ah! Thanks. Now comes the hunt for spare parts! Hope I haven't gotten in over my head.

What parts does it require?

It's getting much more difficult to acquire parts for watches that age nowadays. Many times need to manufacturer them.

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New crown (whole thing), new mainspring, barrel, balance wheel and hairspring assembly

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I ordered a new crystal and I think I ordered the right mainspring too. Need to find the right size winding tool so I can install the mainspring in a new barrel

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Billfrench

New crown (whole thing), new mainspring, barrel, balance wheel and hairspring assembly

Jesus. That's a bit much. Would have been better to use that one for parts and just aquire another better condition movement.