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"RA" means "Remontoir Ancre" or stem-wound with lever escapement.

 

So it's a description of the type of caliber.

And 13''' means 13 "lignes", which is a unit of measurement for watch movements (not a reference number).

1 Ligne=2.25583 mm (1 mm=0.4433 lignes).

So 13''' (13 lignes) means that the movement is 29,33 mm in diameter.

Best, Emmanuel

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