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Citizen Cosmotron 7804 High Beat 36000 bph (Sold)


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The Cosmotron production run was short, about 10 years in all, since the early 1970s saw the quartz revolution, and older technology was quickly rendered obsolete. However, there was significant development of the technology during its brief history, including raising the beat rate from a conventional 18,000bph at the start to 43,200bph at the end, in those using a relatively conventional balance. Movements like cal. 0802, 0820, 0884, 0840, 0880 and 4840 were even sold to about twenty foreign companies including Bulova, who manufactured complete watches under their own name. Citizen itself was faced with strong competition from the cheaper Seiko-Electronic EL 3300.
The quality of the Cosmotron movement was indicated by its achievement of chronometer standards with the X8 (not this one). This reflects the aims of the electronic technology to increase both reliability and accuracy, both of which were overtaken by the advantages of quartz modules. Still, this Cosmotron retains its analogue charm, which is demonstrated in the date quickset mechanism. One has to move between the time of 20:45 and 03:30h (back and forth) to adjust the date! The day quickset is done by simply pushing the crown.
This particular watch is from the late seventies, as 1972 saw the launch of new models with both date and day complications, now using the 78 movement. With jewels reduced to 8, and now powered by 1.3v silver oxide batteries, the movement design had been refined, with more functions. The rate increased to 36,000bph and movements were designated 7801A, 7802A, 7803A, 7804A (this one!) and 7806A. Also, the X8 name had been dropped, so dials are marked Cosmotron, Electronic and carry the Cosmotron applied logo.

Manufacture: Citizen
Model:             Cosmotron
Reference:      7804 4-790791TA
Movement:     Electronic 36000bph (10bps)
Jewels:           8 jewels
Serial No.:       5100xxxx
Case:               38x41x14mm without crown
Crystal:           Hardlex facetted
Dial:                 Green Gradient
Bracelet:         Replacement 205 mm around 
Lugs & Clasp: 18mm lugs
Production:     Mid seventies
Condition:       09 - Excellent: like a jewel, clear case & crystal