Manufacturer Bulova (Citizen) Caliber Number 8137 Jewels 11 Frequency 262.144 kHz Quartz Crystal 3-prong torsional resonator Hacking? Yes (energy saving)...
High Accuracy Quartz
Manufacturer Omega Caliber Number 5619, 5619A In-House? Unknown Dimensions Unknown (please add to the comments) Battery Cell Number CR2320 Battery...
Manufacturer Bulova (Citizen) Caliber Number P102 (P102.10, P102.12) Diameter 12.5”’ (about 27mm) Battery Number CR2016 (3V) Jewels 8 Frequency 262.144...
Manufacturer Omega Caliber Number 1680 Base Caliber ETA 252.511 Type SuperQuartz Dimensions 11 1/2”’ Battery Number 399 Jewels 11 Thermocompensated...