I'm not actually sure why you want to change it anyway, looks ok to me and kinda in keeping with a 40 odd yr old watch, in fact its much smarter than most vintage FF inserts that pop up from time to time (at crazy prices, and often having been done for 45mins @ gas mark 5...)
I like the 'sans' pearl look too on a vintage piece, so much so that I'm in the process of removing the trit' pearl from my FF insert on my 1680.
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