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5512 vs 6538
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| Specification | ||
|---|---|---|
| Nickname | — | Big Crown |
| Production | 1959–1978 | 1955–1959 |
| Era | Crown-guard vintage | 1950s big-crown divers |
| Status | discontinued | discontinued |
| Case diameter | 40mm | 38mm |
| Case material | Stainless steel | Stainless steel |
| Bezel | Unidirectional 60-minute | Bidirectional 60-minute (early) diver bezel |
| Bezel material | Aluminium insert | Aluminium insert |
| Crystal | Acrylic | Acrylic |
| Crown | Triplock / Twinlock (era-dependent), with crown guards | Oversized 8mm 'Big Crown' Twinlock, no crown guards |
| Caseback type | Screw-down solid | Screw-down solid |
| Water resistance | 200m | 200m |
| Dial | Black | Black |
| Dial configuration | 4-line, chronometer-certified | Gilt gloss, 4-line / 2-line variants |
| Hour markers | — | Painted with gilt surrounds |
| Hands | Mercedes hands | Pencil hands |
| Lume | Tritium | Radium |
| Lume type | Tritium | Radium |
| Movement | Automatic | Automatic |
| Caliber | 1530 / 1560 / 1570 | 1030 |
| Manufacturer | Rolex | Rolex |
| Winding | automatic | automatic |
| Functions | Hours, minutes, seconds | Hours, minutes, seconds |
| Aliases | — | 6538A |
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