Cool Rolex of the Day #1368 (Cool Tudor Tuesday #176): Tudor 90910 Submariner, steel, 31mm (only made in this size for about a year). Circa 1979 : r/rolex
Tudor Oysterdate Prince Submariner 90910 Vintage | SwissWatchExpo
Tudor Mini Submariner Snowflake Ref 90910, Photo 13068 on Gmtbroker
Tudor Submariner ref 9091/0 for Price on request for sale from a Trusted Seller on Chrono24