Reference 3700, the "Jumbo" Nautilus was produced from 1976 until around 1998, powered by the best ultra-flat automatic movement at the time: calibre 28-255 C, which is based on a LeCoultre ébauche. The cases were manufactured by Favre-Perret and they existed in stainless steel, steel and gold, 18k yellow, white gold and platinum with dials hand made by the highly skilled Stern Frères creators. The signature on the bottom of the dial is “O SWISS O,” meaning the markers are gold.
At the time it was launched, the Nautilus was advertised as the most expensive steel watch on the market. The watch was designed by Gerald Genta, as a competitor to Genta's already successful Audemars Piguet Royal Oak model. The watch was advertised as "possibly the most exclusive steel watch you can own".
For an 18k gold and stainless steel reference 3700, please see Lot 2312 in this sale.