Bugüne kadar bir cok kisi Daytona'nin El Primero ile güclendigini yazdi cizdi... Rolex tarihinde ki belkide tek acik olan El Primero mekanizmalar üzerinde ciddi degisiklikler yapilarak kullanildi. Ben bunlari daha önce defalrca Türkce yazdim ama birazda yabanci kaynaklardan bunlari okumak belki daha aydinlatici olacaktir
Zenith El Primero- The El Primero movement has a frequency of 36,000 alternations per hour. This high rate allows a precision of 1/10th of a second. Most automatics run at 4Hz, or 28,800 vibrations per hour, the El Primero, though, runs at a much higher 5Hz or 36,000 vibrations per hour. Rolex previously used this movement to power their Daytona chronograph, however, they ran it at 28,800 vph
to increase reliability.
Daytona 16520 Story
The Daytona popularity became a phenomenon when Rolex announced that the previous models were discontinued and that a new model will soon be released. In a matter of months, the Cosmograph Daytona price skyrocketed. The buyers were mostly Italian collectors and dealers. Until 1992, and the devaluation of the lira, the Italian market had mostly contributed to the price inflation of the Daytona. From 1992, the Japanese and American markets had picked up on the Daytona craze and the prices continued to rise.It is within that context that Rolex released in 1988 the new Daytona 16520 (fig 1). It had a larger 40 mm case a shoulder crown guard and a sapphire crystal. Also, the Daytona 16520 was fitted with the Zenith El Primero 400, renamed Rolex Calibre 4030. It was the first automatic Daytona and the only stainless steel model with was a certified chronometer. Thus the dial had the words "Oyster Perpetual" and "Superlative Chronometer officially certified" added. This model had many dial and case combination from Stainless steel to 18kt White Gold (reference 16519 released in 1997) on a strap, but also 18kt/SS (reference 16523) (fig17) on a bracelet and 18Kt Gold on Bracelet (reference 16528) or a strap (16518) (fig 12).
Rolex Daytona 4030 Calibre
The Rolex 4030 (Fig. 14) was based on the famous automatic Zenith El Primero 400. The movement has a rotor mounted on ball bearing with an autonomy of 40 hours. Rolex made many modifications to the El Primero. The most important are to reduce the balance oscillation from 36,000 beats per hour to 28,800, thus reducing the frequency from 5 Hz to 4 HZ, a Breguet balance spring was added. A Glucydur balance, a Microstella fine adjustment . This is a column wheel chronograph. The movement has a diameter of 30 mm (13.5 lignes), thickness of 6.55 mm and 31 jewels.Model 16520, 16523, 16528,etc…
Son bilgi ise El Primero bazli 4030 mekanizmalarin son kullanilma tarihi 1999 üretimli 2000 Model Daytonalardir.
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