Otsuka Lotec No. 7.5vsOtsuka Lotec No. 6
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Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.
No. 7.5
No. 6
Diameter
40mm
42.6mm
Thickness
11.2mm
lowest
11.8mm
Water Resistance
30m
30m
Power Reserve
40h
40h
Movement
Miyota 82S5
Miyota 9015
Case
3 specsMovement
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Otsuka Lotec 7.5号 is praised for its monochromatic swagger and jump-hour complication. Overall, owners rate the Otsuka Lotec 7.5号 highly for its monochromatic swagger and jump-hour complication.
The jumping hour complication with instant hour changes is a standout feature. The mixed hairline and sandblasted finishing on the 40mm steel case is also noted. Reviewers did not reach a consensus on any weaknesses or points of disagreement.
Otsuka Lotec 6号 is widely praised for its exquisite finishing and unique, coherent industrial design, drawing inspiration from vintage steam gauges and automotive dashboards. Owners appreciate its Steampunk aesthetic, detailed design elements like dial font and polished screws, and the proprietary double retrograde complication. The watch features a flat sapphire crystal with AR coating, and its Miyota 9015 movement is noted. However, some find the price excessive for a modified Miyota movement, and availability is extremely limited, primarily restricted to Japan. Accuracy figures reported by owners range from +1 to +6 seconds per day, with one noting the retrograde display can occasionally show a discrepancy of up to 60 seconds during reset. Overall, owners and reviewers rate the Otsuka Lotec 6号 highly for its distinctive design and finishing at its price point, despite acquisition challenges.
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