Reference:116523: Difference between revisions

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== Movement notes ==

Every 116523 is described with caliber 4130 in the cited reference record. The movement uses a column wheel and vertical clutch, runs at 28,800 vph on 44 jewels and has an approximately 72-hour reserve. ~~Hairspring~~ and certification wording should be checked against the production period and service history. The 4130 moves the running seconds to six and the 12-hour counter to nine compared with the 4030-era layout.

Every 116523 is described with caliber 4130 in the cited reference record. The movement uses a column wheel and vertical clutch, runs at 28,800 vph on 44 jewels and has an approximately 72-hour reserve. The regulating spring and certification wording should be checked against the production period and service history. The 4130 moves the running seconds to six and the 12-hour counter to nine compared with the 4030-era layout.

The headline detail is shared across the generation: cal 4130 is Rolex's first wholly in-house chronograph. Thirty-seven years of bought-in chronograph bases — the Valjoux 72 family from 1963 onward, the Zenith El Primero base from 1988 — ended when the 4130 launched in 2000. The 116523 sits in the first model year of that transition. For the full caliber lineage and the 4030-to-4130 architecture comparison see [[Reference:Movements#cal-4130]].

@@ Line 77: / Line 77: @@
 == Movement notes ==
-Every 116523 is described with caliber 4130 in the cited reference record. The movement uses a column wheel and vertical clutch, runs at 28,800 vph on 44 jewels and has an approximately 72-hour reserve. Hairspring and certification wording should be checked against the production period and service history. The 4130 moves the running seconds to six and the 12-hour counter to nine compared with the 4030-era layout.
+Every 116523 is described with caliber 4130 in the cited reference record. The movement uses a column wheel and vertical clutch, runs at 28,800 vph on 44 jewels and has an approximately 72-hour reserve. The regulating spring and certification wording should be checked against the production period and service history. The 4130 moves the running seconds to six and the 12-hour counter to nine compared with the 4030-era layout.
 The headline detail is shared across the generation: cal 4130 is Rolex's first wholly in-house chronograph. Thirty-seven years of bought-in chronograph bases — the Valjoux 72 family from 1963 onward, the Zenith El Primero base from 1988 — ended when the 4130 launched in 2000. The 116523 sits in the first model year of that transition. For the full caliber lineage and the 4030-to-4130 architecture comparison see [[Reference:Movements#cal-4130]].