It’s been said many times that there’s nothing special about this movement, nor is it difficult for any competent watchmaker to service.
That said: I’ve sent three different vintage cal. 321’s to three different independent watchmakers, and it was nothing but a quagmire getting them to run correctly, and finding out what the relevant issues were that were causing the problems. In light of that, I would sooner use a cal. 861 as a daily. Just my experience…
Click to expand...