Cc Bg 1920 1280
Citizen Caliber B877

Citizen Caliber B877

Manufacturer Citizen
Caliber Number B877
Type Quartz, solar powered
Lignes 12.5”’
Diameter
28.4mm
Height
3.8mm thick
Frequency
32,768Hz
Capacitor
MT920 (#19-295/56)
Integrated Circuit
C/MOS-LSI
Hand Count
4
Functions Central hours, central minutes, central seconds, central 24 hour hand, date at 3:00
Country of Manufacture Japan
Known Models
Citizen Promaster Nighthawk (Ref: BJ7006-56L, BJ7135-02E, BJ7138-04E, etc) (Add your watch to the comments below…)

The Citizen caliber B877 is a solar powered (Eco Drive) quartz watch movement found in the Promaster Nighthawk family of watches.

Some of the topics covered in this caliber listing:

Accuracy

Citizen claims that the accuracy of the B877 is within +/- 15 seconds per month when the watch is in normal operating temperatures of +5C to +35C (41F to 95F).

Power Reserve

The B877 holds a power reserve of up to 6 months on a full charge when the capacitor/battery is storing energy correctly.

B877 Charging Time

The fastest way to fully charge your B877 powered watch is to expose the dial side of the watch to a bright and sunny day for about 9 hours. When doing this, be careful that the sunlight is not too hot or else it can damage the dial. You can try to place your watch on a windowsill which gets full sunlight, in an air conditioned room. Periodically check to make sure the dial is ok and that the watch is not getting too warm.

If you attempt the same as above but on a cloudy day, it can take up to 33 hours. Fully charging under a fluorescent lamp can take 105 hours, and regular interior lighting takes as much as 640 hours (almost 27 days of continuous exposure to the light). The Citizen B877 cannot be overcharged.

Low Battery Indicator

The B877 features a built-in Insufficient Charge Warning Function. When the watch does not have sufficient energy to operate correctly, the seconds hand will jump in a two-second interval for about 3 days. When your watch starts skipping like this, refer to the charging information above to get it back to full charge. If you feel that you have done the appropriate steps to fully charge your watch but the seconds hand is still skipping/jumping, then perhaps your capacitor/battery cell needs replaced.

Instructions

Additional Resources:

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10 Comments
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Jolu
Jolu
1 year ago

Recently I got this caliber in my Citizen Promaster GMT and is showing a accuracy of 0 seg /day in the last month , amazing accuracy.

Byron
Byron
8 months ago
Reply to  Jolu

My Nighthawk is 2.5 yrs old (bj7000-52e) pretty much mirrors your findings. -3/+2 PER MONTH. blows me away.

tIME4tIME
tIME4tIME
3 months ago
Reply to  Jolu

Crazy consistency. Have had my PM NIGHTHAWK (bj7000-59e) for 3 years and has NEVER been more than 2.5 seconds +- of perfect. Going to build a “traditional GMT” when I can satisfy myself with the perfect Citizen case. Open to suggestions regarding “perfect case” for build.

Eric in Arlington
Eric in Arlington
1 year ago

Thanks for posting the manual! I got my Citizen Promaster BJ7111-86L from Sakura and it came with a Japanese manual. Great watch so far, very accurate movement!

Byron
Byron
8 months ago

GMT,right?? Hope that’s the “next” one!! SOON

JC
JC
1 year ago

I have the BJ7115-85E, Brave Blossoms JDM GMT Diver. Excellent watch, combines my two favorite features, diver and GMT.

Byron
Byron
8 months ago

Also add the Nighthawk bj7000-52e to the list of units with the b877 “perfect “ mvmnt

Martyn
Martyn
5 months ago

I believe my Citizen Promaster Eco-Drive BJ7100-82E (World Time Zones) watch has this movement. Accuracy is great, but I did replace the metal watchband with a NATO/ZULU strap, 22mm lug size. Beast of a watch, my go-to watch for action (my daily is an automatic Steinhart B-Uhr with a top grade ETA 2824-2 movement).

Citizen-BJ7100-82E-Promaster-daylight
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