Following the launch of its Crystal Seven line in 1965, Citizen later introduced ’custom’ models with more modern designs, reflecting the design trends of the late 1960s / early 1970s. Using the 5204 movement with 23 jewels this model – case number 4-521226Y – has an unusual dial and hand set. Although rather too heavily polished my example is otherwise OK, and since they are not often seen I can live with the refurb 
:
The dial features 5 minute markers rather than the standard hour markers, with lumed batons on the chapter ring. The main hands are interesting, with straight black blades that have painted white centres and luminous points:
The back shows rather too enthusiastic polishing – serial number gives production date of August 1969:
The 5204 movement runs at 18,000bph, with hand winding, but does not hack:
The crown is typically signed:
The Crystal Sevens were a medium to high grade range, and the Custom models offer some interesting alternatives to the more traditional models.
Here’s another example featured a little while ago:
http://sweep-hand.org/2012/08/14/this-weeks-featured-watch-38-crystal-seven-custom-33-jewels/
And here’s a more conventional design:
http://sweep-hand.org/2011/06/23/this-weeks-featured-watch-8-the-crystal-seven-27-jewels/
Finally, it’s worth noting that Citizen used the same dial (with different model logos) and hand set, but in a squarer cushion case in their subsequent Seven Star Custom V2 line, as seen in this 1971 catalog image:
