This Japanese made 1970s Citizen Electronic Cosmotron 7804A Stainless Steel Automatic Watch is in extremely good working condition, however, timekeeping accuracy has not been measured.
Citizen claimed that the Cosmotron was: ‘The world’s first genuine electronic wristwatch that has adopted a moving-magnet type balance motor, driven by transistor on the regulating device.’
Cosmetically, the tonneau shaped case and bracelet present superbly for a forty year old watch with a few minor blemishes/scuffs.
As per most vintage watches, the original water resistance rating has not been verified and we would not recommend that this watch is exposed to water. Additionally, it would be prudent to have the watch serviced by a reputable watchmaker before pressing into routine use.
Comes with a mounted Citizen Stainless Steel bracelet with clasp.
The watch case is marked on the back as follows:- SSB Citizen Electronic Water Resistant 7804-790219TA 31000587 60-6111 GN-4-S
The dial is marked:
Citizen Electronic Cosmotron
Japan 7803- 790143 KA
Summary * Stainless Steel Case reference 7804-790219TA * Dial reference 7803- 790143 KA * Case number 310 00 587 60-6111 * Case/bracelet in excellent condition with superficial blemishes * Dark Grey Dial With Black surround (Minutes, Hours and Seconds displayed) * Date Window: comprising day and number * Unboxed * Approximate Size
Width= 39mm
Length between lugs: 45mm
The Citizen 7800 Cosmotron series was first released in 1972. Four different calibers exist: 7800, 7801, 7803 A and the 7804 A. The jewelling was reduced to 8 and powered by 1.3v silver oxide batteries. The rate was increased to 36,000bph. When the watch is held upright, press in the crown to correct the date. When the watch is held upside down and the crown depressed, it advances the day. Frequency 6 Hz.
