1911 rare early round silver vintage Rolex watch

A rare early round silver vintage W&D (Wilsdorf & Davis) Rolex watch. The case measures 33 mm in diameter. The case is hallmarked London 1911, signed W&D (Wilsdorf & Davis), and numbered 448996. The Swiss movement has 15 jewels and is signed W&D. The unsigned, white enamel dial has black Arabic numerals with a red twelve and a subsidiary seconds dial.