Bert’s comments yesterday included a pic of his beautiful dual crown Seven Star Deluxe diver, and this inspired today’s piece. My Seven Star export model, with red dial. It’s marked ‘waterproof’ rather than ‘parawater’ and the Seven Star name is not printed on the dial, so it was not for the Japanese domestic market. With a 52 day/date 21 jewel movement as per the Crystal Seven it runs at 18,000 beats per hour, and features an inner rotating ring moved by the crown at 2 o’clock along with large lumed markers and a classic diver handset, including a nice ‘lollipop’ second hand. Date is quick-set, and it hand winds, and it is rated to 100 meters, so only designed for swimming and maybe a bit of snorkelling. This one is from April 1969:

For info on all Citizen’s vintage divers, including other variants of today’s watch, have a look here:
https://sweep-hand.org/citizens-vintage-divers-1962-to-1980/

And Bert’s lovely watch is in the comments of this post:
https://sweep-hand.org/citizens-vintage-divers-1962-to-1980/