Wanted a little colour today, so I’ve been wearing one of Citizen’s querkily named Dandy Sevens. All of these use a 27 jewelled version of the 52 (day/date) movement first seen in the Crystal 7 of 1965. Launched in 1968, the Custom versions have split date and day windows as did the Crystal Seven Customs. They seemed to have briefly preempted the more colourful dials and case designs of the 1970s. Mine is from July 1969 and has yellow on the hour markers, as well of course as the Dandy Seven name, together with a unique applied logo:

This one is running very nicely – and more info is available here: https://sweep-hand.org/2012/07/15/this-weeks-featured-watch-38-the-dandy-seven-custom/