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Prices come from the reviews in their original currency and market. Article dates are shown below.| Specification | RGMModel 501-PC Perpetual Calendar | LonginesUltra-Chron Carbon |
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| Reference | 501-PC | L2.839.4.52.2 |
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| Winding | Automatic winding | Automatic winding |
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| Calibre | RGM / ETA 2892-A2 / Dubois Dépraz | L836.6 |
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| Diameter | 39 mm | 43 mm |
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| Size / thickness | 39 mm | 43 mm |
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| Power reserve | 52–56 hours | 52 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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RGM · Model 501-PC Perpetual Calendar
Strengths
A persuasive calendar project for someone who values enamel and classical layout. Transparent mechanical origins are a strength.
Things to consider
At US$39,900, assess servicing and delivery; reset the calendar strictly according to its instructions.
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.
