I really like the OysterP. 39mm in black or white. I am "studying" on the forum to understand which one is the best, which one more reliable etc. It would seem to be the best but unreliable ARF for movement, but also for black and white colors? Then I saw various factories, GMF, but also ACF but nothing is found on the forum. Do you know what are the differences between one model and another and what is actually worth taking? P.S. White ACF costs 328, has 316 steel, 2824 movement but seems to have the light of the different colored hands.