This movement has pretty lower top quality finishing. The hairpspring is mounted counter clockwise. Steer clear of this movement if possible. There is also a no-day Variation of this movement known as the SH3130 (or in some cases the AR3130) that's of similarly very poor top quality. The oscillator of https://emilianokkjhc.blogdosaga.com/33069275/aaa-rolex-watches-secrets