|Brand:||Seiko, Seiko Instruments Inc.|
|Winding:||Automatic, Bi-Directional Automatic Winding|
|Diameter:||27.40 mm (12 ligne)|
|Complications:||Date, Date by Pointer, Hacking Seconds, Hand Winding, Power Reserve Indicator, Quick Date Correction|
|Hands:||Central Hour Hand, Central Minute Hand, Central Power Reserve Pointer, Central Seconds Hand, Date Pointer at 6:00|
|Production: 2017 – Current|
Seiko Cal. 4R57A (commonly called just Cal. 4R57) is a mainstream automatic movement with central power reserve pointer from 10:00 to 4:00 and date by pointer subdial at 6:00. It is closely related to the date-only Cal. 4R35. Since 2017, Cal. 4R57A is also sold by Time Module Inc. (TMI) as Cal. NE57A to other manufacturers.
Hand winding is accomplished with the crown in first position, rotating clockwise. Quick date correction is accomplished with the crown pulled out in second position, rotating counter-clockwise.
|Spron 510 Mainspring|
NH71A (skeleton, gilt)
|Day and Date||4R36A|
|Date, 24 Hour Subdial||4R37A|
|24 Hour Subdial||4R39A|
|Date by Pointer|