The first of the four part sales will take place in Dubai on October 19, and we'll see two very rare pieces. The first is a reference 3700/1A (the first Nautilus, in steel) that features an Omani crest on the dial. This is just the second such watch – in steel – to be confirmed authentic, and the first bears the preceding case number. What's more, both watches were sold on the very same day in 1978. The watch was retailed by Asprey in London for Omani royalty, and it will hold an estimate of $150,000 to $250,000. The second highlight of the Dubai watches is a piece I have actually never seen before – dubbed reference 3700/3. It is a yellow gold Nautilus with original wide bracelet, but factory diamond bezel. It was, according to Christie's, one of the final first series Nautilus watches to be made by the Favre-Perret case factory. Estimate here is $70,000 to $120,000.