Citizen Caliber Np20 8136

Bulova Caliber NP20

Citizen Caliber Np20 8136

Manufacturer Bulova (Citizen/Miyota)
Caliber Number NP20
Movement Type Quartz
Battery Cell
SR927W (395)
Battery Life Unconfirmed
Frequency 262,144 kHz
Quartz Type Tuning fork type quartz crystal
Jewels 0
Hacking Seconds?
Functions Central hours; central minutes; central chronograph seconds; 1/20 seconds subdial at 3:00; small running seconds at 6:00; 60 minutes chronograph hand at 9:00; some models have a date (at 4:30 or 6:00)
Country of Manufacture Japan
Known Models
Lunar Pilot Chronograph (96B251, 96K111, 98K112, 96A225), Chronograph C (96A283, 96K101) (Add your watch in the comments below…)

The Bulova caliber NP20 is a High Precision Quartz aka HPQ (sometimes written as High Performance Quartz) chronograph watch movement with Ultra High Frequency (UHF) of 262.144 kHz. Bulova refers to it as a 3 eye chronograph movement. It is made in Japan and has 0 jewels.

In Bulova’s own words:

“A movement featuring a 3-pronged quartz crystal with a frequency of 262 kHz that is 8 times greater than standard quartz, leading to an accuracy of seconds a year.” –source

Bulova NP20 VS 8136:

Bulova offers almost no information about their movements. It appears that the NP20 is what they are calling the Bulova caliber 8136 (Citizen/Miyota made). Caliber Corner is still working on getting more information about this, including a hands-on and break down of the movements for photos, etc. In the meantime, you may want to read through the Bulova 8136 caliber listing and the discussion threads over there.

Update: In March of 2023, Caliber Corner acquired this Bulova Lunar Pilot Chronograph watch for the purpose of uncovering the mystery behind the NP20. As it turns out, the watch advertised by Citizen as having an NP20 movement, is actually a Bulova caliber 8136 as suspected above. While the movement itself is signed Bulova, we know that Bulova has been owned by Citizen since 2008 (source). This means the movement is actually a Miyota, since Citzen owns Miyota as well, but specially tuned for Bulova for use in their High Performance Quartz watches.

Caliber Confusion:

If it is an 8136 then why do they call it the NP20? Who knows. Short answer: maybe marketing. It could be that they sought to change the name of the movement to NP20 so that it sounds more like a Bulova specific movement, by not using the typical 4-digit Citizen caliber number system. The NP20/8136 is a Bulova-only movement as far as we know, so that makes sense, but what doesn’t make sense is calling the movement “NP20” on their product pages, then opening it up to find a movement marked “8136”. This causes caliber confusion.

Date VS No Date:

With the news of the recent release (February 7, 2023) of the Bulova Lunar Pilot No-Date (refs: 96K111, 98K112), it seemed as if the community would be getting a new caliber number from Bulova – only to find that the movement in the new no-date is called an “N20”, just like the date model. It’s disappointing that Bulova did not come up with a way to distinguish the no-date caliber from the date version (ref: 96B251). If one has a calendar complication and the other does not, then they are not the same movement (assuming that the no-date does not have a phantom date position), and should each have their own caliber designation.

Additional Resources:

Seagull Caliber St19

Join our mission to spread movement awareness!

Members Online

  • keepthetime pc1093

Recent Forum Posts

Trending Comments


Sellita Caliber SW200 VS SW200-1

Wow man, you should join the R0l3X club, they're desperately looking for new members, but…


Sellita Caliber SW200 VS SW200-1

Basically you are saying that one of the world's most used workhorse movements is complete…


Slava Caliber 2427

Lum-Tec gave up trying to fix my C2 with this movement, now I'm trying to…

Jeremiah B Leonard

ETA Caliber 955.414

I have one in Gucci watch, says Swiss. See photo….


Seiko Caliber 6N52

Thank you for sharing with the community.


Would love your thoughts, please comment.x