Seeking opinions on a Polerouter sub listed recently on Christies that sold for CHF 3750. Seems to be missing an original screw down crown (which can be a serious issue as it is a diver's watch). Rust on seconds hand.. Am I missing anything else? Keen to know your thoughts. ------ UNIVERSAL. A RARE STAINLESS STEEL AUTOMATIC WRISTWATCH WITH SWEEP CENTRE SECONDS, DATE AND GAY FRERES BRACELET SIGNED UNIVERSAL GENEVE, POLEROUTER SUB, REF. 204’615/1, CASE NO. 2’364’183, MANUFACTURED IN 1965 Movement: cal. UG 69, automatic, 28 jewels, signed Dial: signed Case: screw back, 37 mm. diam., signed With: stainless steel Universal Genève bracelet, deployant clasp stamped Gay Frères and 1, 65, overall length of approx. 200 mm., Universal Genève Extract from the Archives confirming the production of the present watch in 1965.