The acronym stood for ‘Watch, Wrist, Waterproof’.
The Longines watch, one of the largest of the Dozen with a case size of 37.5mm, had an estimated production of 5000 pieces (only the Grana with a run of 1500 is harder to find). It houses a chronometer grade movement.
This particular example, above, in good original condition, was offered for sale on June 1 by Hannam’s (23% buyer’s premium) in Selborne where it sold at £4800.
The winning bidder, using thesaleroom.com, went way over the estimate of £300-500.