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You can always find ST96 (mumbi special) from India, since they still are made in India and widely used there.
You can get two watches for the price of a seagul movement.
I think the reason Mark uses seagul is wide availability and newness, so you wont be spending more time on finding a movement and cleaning than actual learning of the lessons.
ST96 in manual wind, easy to work on, yet higher quality than chinese.
Should expect a home made dial in the case though.
I can't recommend any American movements, but there are a lot of Swiss or German ones from the 50s or 60s which we're made in large quantities and for which you can easily and cheaply find spares or donors. They we're built to be serviced too, which makes them fun to work on. I'm thinking AS, Osco, FHF/Standard, Peseux etc.
I doubt it is the movement or jarring of your hands. I can't Imagine that being severe enough to cause this behaviour. Are you using a timegrapher to do the regulation? I would like to see the traces in different positions, fully wound and after 8 hours running down.