This is a moderately collectable clock so it would probably be best to ask in a specialist forum. Here's a couple plus some of the many YouTube offerings:
https://www.collectorsweekly.com/stories/106159-seth-thomas-movement-89
https://mb.nawcc.org/threads/understanding-seth-thomas-89-movement-variations.163320/
https://m.youtube.com/watch?v=mC5BowHOHgI
https://m.youtube.com/watch?v=_6mgPc6kwsc
https://m.youtube.com/watch?v=PnFDKvfRTkM
Ffgg
December 2022