| 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.
Some of the topics covered in this caliber listing:
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:
Video:
https://www.youtube.com/watch?v=Ta-Qja7hJpM
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