If you need the method, that is Episode 0. This page is two watches.
The tease
For twelve years the most famous chronograph on earth ran on a Zenith heart.
A generation later the two names sit on the same table. One is a billboard. One is a name most rooms still cannot spell. The Sport is on this sheet. The current Daytona is not, so this page does not crown a winner.
The loan
The Rolex Cosmograph Daytona of the late 1980s and 1990s, the 16520 generation, used a modified El Primero. Rolex called it calibre 4030. High-beat. Column-wheel. Zenith architecture under a Rolex signature. Around 2000 the 4130 arrived. The loan ended. The modern Daytona, now the 4131, is a calibre Rolex builds in its own workshops.
Zenith kept El Primero. The Chronomaster Sport is that idea in a current steel sports case. Calibre 3600. Five beats a second. A tenth-of-a-second track that is the frequency made visible.
Same job today. Start, stop, reset. Steel. One hundred meters. Integrated bracelet. Tachymeter. Official COSC papers on both. Rolex adds its own seal on top of that certificate. That seal is the brand marking its own homework. It is not a second outside examiner with the watch already in the case.
The market does not treat them as peers. The Daytona is the watch people who do not collect can still point at. In some rooms it changes hands for five times the Sport. The Sport is the watch connoisseurs mention when the room is no longer performing.
Fame is not a point. The invoice is not a point.
Two machines
The Sport is still the high-beat chronograph. Five hertz. Column wheel. Manufacture train.
The Daytona 4131 is four hertz. Column wheel. Vertical clutch. Start and stop without the old lateral-clutch kiss on the seconds train. That clutch is real architecture. It is on the sheet. It is not a logo bonus.
The Daytona is the more compact sports chronograph. Lower case. Ceramic insert. A bracelet step you flip open to change length. The Sport wears larger and taller. Ceramic tachymeter. A sports clasp.
If the Sport shows the train, say so. The Daytona on a solid back does not show hand-finishing you can treat as finishing. That is not a penalty. It is honesty. The finishing is the extra people want. It is not why the number moved.
What to pay is not this episode. You already know which one trades like a trophy.
The sheet
Chronomaster Sport, 03.3100.3600, steel: Tenue Score 53. Raw 53.0. Possible 53.0 to 54.5. Engine Score 22.5 out of 50. Craft 0. Mission fit 18, sport chronograph. Confidence B. Maker protocol.
Daytona 126500LN is not on this sheet. It has no Tenue Score here, and this page will not invent one.
The Sport is a high-beat chronograph with a published score. The Daytona story is the loan, the clutch, and the market. It is not a second total.
Victor, what kind of watch: you voted before the titles.
Finality
Rolex needed El Primero long enough to become Rolex again. Zenith kept El Primero long enough that the movement is still the plot of a steel watch the world can afford to ignore.
Stars will still wear the Daytona. Five times the money will still move in rooms that do not read casebacks. None of that is a scoring error.
On this sheet, the idea they once borrowed is still more watch than the icon they built after they stopped borrowing it.
How much watch: the Sport.
What kind of watch: yours.
What to pay: Ask. Later.
Heath Jackson. The Long Sweep. A program by aeternus.