I have been hearing that vintage cyma watches were of very high quality but since they aren't so popular now the prices on them are relatively low so i have been tooling around taobao and found a few that seem to be interesting.
unfortunately i don't know much about them and there doesn't seem to be much on the forum about them. so my first questions is are the following movements any good (compared to other cyma movements and to others at the time)?
synchron 45 17 jewel manual wind date
488 18 jewel manual wind date
synchron 40 17 jewel manual wind
synchron 42 17 jewel manual wind
thanks for letting me pick your collective brains