Probably the only Panerai wristwatch that still sells for more than its original retail price (oh how times change), the Luminor Submersible Bronzo has enjoyed remarkable robustness of demand. The third iteration was unveiled just earlier this year, and now the total number of variants is four, with the latest being a one of a kind variant put together for a British charity.

Soon to be sold online at Sotheby’s, the new Luminor Submersible 1950 3 Days Automatic Bronzo PAM00907 has a dark brown dial, in contrast to the military green and blue dials of the limited edition versions (the PAM 382, PAM 507 and PAM 671 respectively). Dial colour aside it is otherwise identical to the most recent Bronzo PAM 671 unveiled earlier this year, being powered by the P.9010 automatic movement that shows the time and date. Besides the watch, the winner of the lot will also get to visit the capacious, two-storey new Panerai boutique on New Bond Street.

Named The Panerai Experience Online, the auction runs from November 30 to December 15, and includes several other watches made specifically for the event. All proceeds from the sale will be donated to the Royal Yachting Association to help support Onboard, a programme that helps young people from all backgrounds go sailing (presumably only those who can’t afford a boat).

Once bidding is open, the catalogue and online bidding will be available on Sothebys.com.