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Prices come from the reviews in their original currency and market. Article dates are shown below.| Specification | LonginesUltra-Chron Carbon | Renaud TixierMonday Skeleton Blue |
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| Reference | L2.839.4.52.2 | RVI2025MONSK2 |
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| Winding | Automatic winding | Automatic winding |
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| Calibre | L836.6 | RVI2025 |
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| Diameter | 43 mm | 40.8 mm |
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| Size / thickness | 43 mm | 40.8 mm |
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| Power reserve | 52 hours | ≥72 hours |
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| Case material | Not stated in the review | Not stated in the review |
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| Functions | Not stated in the review | Not stated in the review |
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| Crystal | Not stated in the review | Not stated in the review |
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| Water resistance | Not stated in the review | Not stated in the review |
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| Price and market | Not stated in the review | Not stated in the review |
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Longines · Ultra-Chron Carbon
Strengths
An interesting route to high-frequency mechanics and a technical case at a moderate budget within this selection.
Things to consider
43 mm warrants a fitting; US$5,550 is a US price, not the final cost in Uzbekistan.
Renaud Tixier · Monday Skeleton Blue
Strengths
A rare opportunity to see a winding concept on the dial. The strongest argument is the mechanism rather than the number of exposed parts.
Things to consider
30 m water resistance and a busy background make legibility and service arrangements important checks.
