A 1940s Rolex Oyster Imperial Chronometer wristwatch, manual movement, the silvered dial having

A 1940s Rolex Oyster Imperial Chronometer wristwatch, manual movement, the silvered dial having Arabic numerals with a subsidiary seconds dial at six o'clock and blued steel leaf hands, stainless steel tonneau shaped body, back marked 100616 / 3116, together with its original leather case, test certificate, instructions, guarantee, receipt and an insurance certificate, (crown threads worn), 4 x 3 cm [running when cataloged, accuracy and reliability un-tested]