How to identify the smallest 24mm Timex Waterproof Watch smaller than Sportster

This is the often forgotten Timex waterproof watch of the 1960's. It is tiny. It is much smaller than the Marlin, Sprite and sporster. With a case of only 24mm, not including crown, it was worn by women starting in 1965. The movement is the small m78. It is a very interesting movement. it is one of the very few Timex watches that is put together by screws and not rivets. This movement can be easily worked on by a watch repairer.
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