Notes: This watch is a no-date Oyster Perpetual using Rolex's common stainless steel/gold hybrid design. The case is stainless steel and the bezel is 18k yellow gold. The bracelet is a matching gold/stainless hybrid. The bezels can be fluted but is more commonly smooth. The dial faces can vary but blue, champagne, white and gray are all common. The hour marks are sually index or roman but can be also and index/arabic combination. I have only seen 3-link (oyster) bracelets, but it wouldn't surprise me to see a jubilee (5-link) bracelet on one of these. Unlike many similar Rolex models, this one does not seem to have a diamond hour mark option. It likely listed around $6,000 when it was sold in the early 2000s.

The M at the end of the reference number signifies this is a "modified" version of the 14203 with an higher quality movement than the earlier 14203.

Mechanism: The 3130 is the sister movement to the 3135. The 3135 was introduced in 1988, but for some reason the 3130, although simpler due to the lack of a date function, was not introduced until 2001. The calibre 3130 is a self-winding mechanical movement entirely developed and manufactured by Rolex. Like all Rolex Perpetual movements, the 3130 is a certified Swiss chronometer, a designation reserved for high-precision watches that have successfully passed the Swiss Official Chronometer Testing Institute (COSC) tests. It is fitted with a Parachrom hairspring, offering greater resistance to shocks and to temperature variations. Its architecture, in common with all Oyster watch movements, makes it singularly reliable.

The 3130 is distinguished from the 3000 by several features; whilst it still beats at 28,000bph it now uses a balance bridge rather than a balance cock and also has a Breguet overcoil hairspring; this means that now all Rolex movements will feature these two company signatures. Also introduced on the 3130 are a new style of reversers for the automatic movement; these are much more efficient than the ones currently used and are an offshoot of the ones introduced 2 years ago on the 2235 lady’s movement. It can safely be assumed that the new reversers will gradually be introduced across the rest of the range, but it is rare that the “base” movement gets technological advances before the more “high end” variants.

Hacking: When moving the crown from position 3 (hand setting) to position 2 (manual winding), the second hand resumes operation before the crown actually 'clicks' into position 2. And if you release pressure before the crown clicks into position 2, but after the second hand resumes, the crown springs back out and the second hand hacks again. The pressure on the balance through the "stop seconds lever"/"balance stop spring" can be released and reapplied before the crown/stem moves into the indexed position. This happens if you hesitate while pushing/pulling the crown/stem into position allowing the balance to start and stop before the crown/stem locates. The hacking mechanism uses a thin, flat brass plate to put pressure on the balance wheel. When the pressure is removed the watch resumes ticking which apparently is not at the same time the crown clicks into position.

Family Notes: In 1926, Hans Wilsdorf introduced the Oyster watch which used a waterproof case, hence the name. He added "Perpetual" to the name when in 1933 he introduced a reliable automatic self-winding watch. Hence the name means "Waterproof, Self-Winding" in Rolex-speak and generally means the watch is water resistant to a depth of 100 meters.