Citizen Crystron 4 Mega

cal. 7370

Factory Spec. 5 SPY

Thermoinsensitive: High Frequency (4 MHz)

User Adjustable: Yes

4 mega

Citizen were the first to market with a 4 MHz watch, and the Crystron 4 Mega is a bit of a 'grail' watch for some collectors. Only recently arrived, a local watchmaker was very helpful in fitting the battery hatch with a new rubber ring and putting in a new battery. It seems to tick along ok, although not all of the markers are hit precisely.

Parent Company Citizen Watch Co.
Brand Citizen
Model Series unknown
Model Name 4 Mega
Model Number unknown
Case Number unknown
Serial Number 902669
Approx. Date of Manufacture February 1979
Calibre (mvt maker) 7370
Calibre (brand) 7370
Factory SPY 5
TC Appproach Thermoinsentive: HF
Frequency (XO 1) 4.19 MHz
Frequency (XO 2) n/a
Rate Adjustment User
Major Inhibition Period unknown
Minor Inhibition Period unknown
Power Disposable cell
Cell Number unknown
Case Back Cell hatch
Water Resistance unknown
Features 3-hand, no numeral dial
  Day, date (not perpetual)
Timing Results Basic data  &  Further details
Images Photos - Large File Sizes!
Documents User manual