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Wind the watch up full and take a slo-mo video of the balance wheel in good light. Now figure out the total number of degrees that the balance swings as it arcs from anticlockwise to clockwise, etc. The total arc should preferably be 270+ degrees in each direction, for a watch running healthily. Any less than something like 200 degrees and I would suggest that it probably needs cleaning. It's also quite cool to watch in slow motion.
Someone has described amplitude here:
rodabod
Olly398
Certainly do. Wanna see a vid of the action?