Nivada Grenchen Chronomaster ManualvsYema Skin Diver CMM.20

Owners praise the Nivada Grenchen Chronomaster Manual as a reasonably sized mechanical chronograph without a module movement. One owner notes the watch sits high on the wrist due to its automatic caseback, leading to some regret. On balance, owners value the Chronomaster Manual for its non-module mechanical chronograph movement in a reasonably sized package.

Owners and reviewers widely praise the Yema Skin Diver CMM.20 for its vintage aesthetic, 39mm-39.5mm case size, and the in-house CMM.20 micro-rotor movement. The watch features a textured cream dial, sharp applied indices, and a satisfyingly over-engineered push-to-turn bi-directional bezel. The fully brushed bracelet with toolless micro-adjust clasp is highlighted as a significant improvement, though some note its extended lug-to-lug may challenge smaller wrists. Accuracy figures range from -3/+7 seconds per day to erratic results between 0 and -10 seconds per day, with a 70-hour power reserve. Some owners express concerns about the brand's QC reputation and the micro-rotor movement's performance, while one reviewer noted questionable finishing on a prototype's hour hand and a rattly clasp. Overall, owners and reviewers rate the Yema Skin Diver CMM.20 highly for its vintage styling and improved bracelet at the price.