Rolex 1970s Submariner with the so-called ‘single red’ Mark IV dial – estimate £16,000-20,000 at Chiswick Auctions.

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This version of the diving watch was produced for only a brief period of less than three years from 1973-75. It features a calendar with ‘cyclops’ lens and the dial with the word Submariner picked out in red.

It was the last Sub to feature red lettering and the last to use tritium for its luminescence.

This timekeeper, with factory paperwork dating it to December 1975, is guided at £16,000-20,000 in the November 24 sale.