Longines platinum and diamond wristwatch, retailed by Drummond, 1920s, the lady's platinum manual winding wristwatch with 18 jewels, adjusted to isochronism, silvered dial with applied baton indexes, blued steel hands, the rectangular case within single cut diamond surrounds, on an openwork bracelet of geometric design set with baguette, circular and single cut diamonds to a double black cord strap, dial and movement signed Longines, dial and case signed Drummond, WD & Co., width approximately 10 mm.