Seiko Caliber 4r36a Drawing

Seiko Caliber 4R57

Seiko Caliber 4r36a Drawing

Manufacturer Seiko
Caliber Number 4R57, 4R57A
Movement Type Automatic
Lignes 12”’
Thickness
6.63mm
Jewels 29
Vibrations Per Hour
21,600 bph (3 Hz)
Lift Angle
53 degrees (needs confirmed)
Power Reserve
~41 hours
Hand Windable? Yes
Hand-Winding Direction
Clockwise
Rotor Winding Direction
Bi-Directional (Magic Lever)
Hacking? Yes
Anti-Shock System
Seiko Diashock
Regulator System
ETACHRON
Hand Count
5 hands
Functions Hours, minutes, central seconds, date calendar subdial at 6:00, power reserve indicator spanning from 11:00 to 4:00.
Country of Manufacture Japan
Known Models
Seiko Presage: SSA303, SSA305, SSA308, SSA343, SSA346, SSA354, SSA387, SSA392, SSA393, SSA397, SARY079, SARY081, SARY082, SARY129, SARY131, SARY135, SARY136, SARY143, SARY145; Presage Cocktail Time (Add yours in the comments below…)

The Seiko caliber 4R57 is an automatic movement used by Seiko Watch Corp. in their own branded watches. Notable features of this 4R series caliber includes a power reserve indicator and date subdial. This caliber has been available in Seiko models since at least 2016.

Caliber 4R57 VS SII NE57:

The caliber 4R57 is basically a Seiko-only version of the NE57. Seiko Instruments (aka SII) sells the NE57 to other manufacturers for use in non-Seiko watches.

Interesting note: Although the 4R57 features a power reserve indicator spanning from about 10:00 to 4:00, the SII drawings for the NE57 show the power reserve located from about 8:30 to 1:30.

Differences Between 4R57 and 4R57A?

The A indicates that it is the first generation of this caliber. 4R57 and 4R57A are the same. Subsequent letters indicate updates to the base caliber.

Accuracy Rating:

Seiko claims that the accuracy of caliber 4R57 is between -20 / +40 seconds per day. This rating is based on normal daily wear on the wrist in temperatures between 2 ºC and 23 ºC. When testing your watch for timekeeping, make sure it is fully wound.

Crown Position Functions:

0 (against the case): Clockwise = Manual Winding / Counterclockwise = Nothing
1 (pulled out one click): Clockwise = Nothing / Counterclockwise = Date setting
2 (pulled out two clicks): Time setting clockwise and counterclockwise

Stem Removal:

To remove the stem, make sure the crown is in position 0 or normal position (not date or time setting position). There is a lever with a small indentation for your tool. Gently press down while pulling the stem out. See official instructions below for more guidance:

Seiko Caliber 4r36 Stem Removal

Video:

https://www.youtube.com/watch?v=Ta-Qja7hJpM

Examples of Watches With This Movement:

Additional Resources:
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Roba
Roba
3 years ago

Harbinger * Marauder uses the NE57

David Collins
David Collins
2 years ago

I got a Seiko Presage graduation from Brandman University. It did not hold up as well as my Seiko chronographs. I sent the Presage for repairs and Seiko claimed some of the parts were not under warranty and charged me $49.00 extra for repairs. They have had my watch since April and I just got it back of July 22nd. Seiko was not real cooperative when I asked them for a refund or replacement ,because they claimed they did not have the parts to fix the watch I sent them for repair. This watch is a real disappointment

Ian Watson
Ian Watson
10 months ago
Reply to  David Collins

I bought from Seiko a Pulsar VR43 solar chrono and within a few weeks it went downhill and Seiko UK refused to honour the warranty and kept telling me to go back to the seller who had gone bust due to the pandemic. Major circular argument back and forth in the end I fixed it myself but awful awful customer attitude caused by Seiko dropping Pulsar in the months after I bought it and was told they no longer did anything for Pulsar’s full stop. I vowed never to buy new from Seiko again but I did grab a Lorus… Read more »

Justin Smathers
Justin Smathers
2 years ago

I own the unbranded version of the 4R57, the NE57, which is cased up in my Aragon, “Regeneron,” 42mm case size. I have not owned the timepiece for very long at this point, as it is a new release. This generation was released in early December of last year, which would be 2021. Having been wearing the model consistently for the last month, I feel that the movement is now “broken-in,” and I can report that it is performing on wrist at +7 sec/day. I really enjoy the overall structure of the way the information is presented. The dial is… Read more »

Stephan
Stephan
1 year ago

I’ve been sitting on a sale to get that exact watch. Now I’m going to pull the trigger, thanks!

Steve
Steve
1 year ago
Reply to  Stephan

I ordered a 43mm stainless steel Regeneron, white dial, day before yesterday.
Seemed particularly good value, much cheaper than getting my inaccurate automatic TAG serviced!

Justin Smathers
Justin Smathers
1 year ago
Reply to  Steve

If I could recommend a model, it would be this newest generation of the “Hercules,” in 43mm, and w/ the tungsten bezel insert. I own the day/date, NH caliber variation,w/ teal colored dial. As I’m sure you are aware of, there are other executions of this piece, done w/ 2 other automatic movements. Both are manufactured by Soprod. The M100 (3-hands, w/ a date), and the C125 (GMT. I can’t speak to the experience of the Swiss auto’s, as mine has the NH36, but the build is the same used in all executions. IMHO, a very slick watch for the… Read more »

Justin Smathers
Justin Smathers
1 year ago
Reply to  Stephan

Yeah I saw that that model, along w/ many others, were a part of Wing’s Memorial Day sale. If you purchased it at the price listed, then you paid the same amount that I did. A steal really to get it at that price. My only complaint is that there are some mildly sharp edges, around the inside of the bracelet, and also, I feel that if Wing had reduced the case thickness by about 2mm, it would’ve been almost perfect. IMHO, anyhow. I own quite a few Aragon models. A lot of value in the brand. They’re not perfect… Read more »

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