Side by side

Tornek-Rayville TR-660 Acrylic Non-datevsYema Skin Diver CMM.20

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

TR-660 Acrylic Non-date
Tornek-RayvilleTR-660 Acrylic Non-date
Skin Diver CMM.20
YemaSkin Diver CMM.20
MSRP $2,372

At a glance

10 of 29 specs differ
Diameter
TR-660 Acrylic Non-date40mm
Skin Diver CMM.2039.5mm
Power Reserve
TR-660 Acrylic Non-date50h
Skin Diver CMM.2040h
Water Resistance
TR-660 Acrylic Non-date200m
Skin Diver CMM.20200m
MSRP
TR-660 Acrylic Non-date
Skin Diver CMM.20$2,372

Full specifications

Case

4 specs
Diameter
40mm
39.5mm
Thickness
14.7mm
11.5mm
Lug-to-Lug
48.5mm
47mm
Material
Stainless Steel
316L Stainless Steel

Crystal & Dial

3 specs
Crystal
Sapphire
Domed Sapphire
AR Coating
Yes
Inner
Lume
Superluminova
None

Movement

2 specs
Caliber
TMI NH38
Yema CMM.20
Power Reserve
50h
40h

Pricing

1 specs
MSRP
$2,372

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What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Tornek-Rayville TR-660 Acrylic Non-date

The Tornek-Rayville TR-660 Acrylic Non-date is a 40mm bead-blasted stainless steel watch with a utilitarian matte black dial and a moisture detector, measuring 14.7mm thick and 48.5mm lug-to-lug, featuring a subtly domed, AR-coated crystal. One owner notes a preference for a different watch's bezel-locking mechanism but appreciates the TR-660's 20mm lug size. Another owner reports damage to the case and bezel, though it includes unused and worn straps. On balance, owners find the Tornek-Rayville TR-660 Acrylic Non-date to have a timeless design that remains appealing.

Yema Skin Diver CMM.20

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.

From video reviewers

The sapphire bezel insert and in-house CMM.20 movement are noted strengths. Reviewers questioned the value proposition compared to other Yema models.

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