|Brand:||Seiko, Seiko Instruments Inc.|
|Reserve:||40, 41 hours|
|Winding:||Automatic, Bi-Directional Automatic Winding, Central Rotor Automatic Winding|
|Diameter:||27.40 mm (12 ligne)|
|Complications:||Hacking Seconds, Hand Winding|
|Hands:||Central Hour Hand, Central Minute Hand, Central Seconds Hand, Open Heart at 9:00|
|Distinguishing Technical Characteristics|
Counter-Clockwise Balance Cock
|Production: 2012 – Current|
Seiko Cal. 4R38A (commonly called just Cal. 4R38) is a mainstream automatic movement with open heart balance at 9:00. It is also offered by Time Module Inc. (TMI) as Cal. NH38A for use by other watch makers. It is closely related to the date-only Cal. 4R35 and the Cal. 4R37 and 4R39, both of which have a 24 hour subdial at 10:00.
Cal. 4R38A is also used in the Seiko Original line, where the company specifies accuracy to -35/+45 seconds per day and 41 hours power reserve.
Seiko 4R38 Watches
Seiko uses Cal. 4R38 in a variety of watches, most of which feature an “open heart” to view the balance at 9:00. Most watches using this movement use code SSA in the United States and SARY or SSVM in Japan.
- Seiko Presage SSA257, SSA258, SSA262, SSA358, SSA359, SSA405, SSA407, SSA409, SSA859
- Seiko Ladies Automatic, SSA781, SSA783, SSA785, SSA848, SSA850, SSA852, SSA854, SSA860, SSA862, SSA863
- Seiko Sportura Automatic, SSA884, SSA885
- Seiko 5 Sport, SSA327, SSA331
Seiko 4R38 Operation
The movement can be manually wound with the crown in position 1. Rotate the crown clockwise to wind the mainspring.
The time is set with the crown in second position (pulled all the way out). Rotate the crown clockwise to advance the minute and hour hands and counter-clockwise to turn them backward.
Seiko 4R Family Overview
Introduced in 2008, the Seiko Instruments Inc. (SII) 4R family is a mainstream automatic watch movement used in many Seiko models and offered to third parties by Time Module Inc. (TMI). It is an evolution of the Seiko 7S family of movements, produced since 1996, and is related to the higher-end Seiko 6R family.
All movements in the 4R family operate at 21,600 A/h and measure 12 ligne (27.4 mm) in diameter by 5.32 mm in height. Cal. 4R15 and 4R16 have 22 jewels, Cal. 4R35A has 23 jewels, and all other 4R and NH movements have 24 jewels. The NH series movements sold by Time Module Inc. (TMI) are rated as slightly more accurate from the factory, at -20/+40 rather than -35/+45 for the Seiko branded movements, and some differ in the finish, number of jewels, and rated power reserve.
Seiko 4R Movements
There are two branches of the family: The 4R1x movements (4R15, 4R16) came first and have an advanced Spron 510 mainspring but lack hacking and hand-winding. The 4R3x movements (4R35, 4R36, 4R37, 4R38, 4R39, 4R57, 4R71) appeared after 2010 and have a traditional mainspring but add hacking and hand-winding. The 6R family has both improvements.
|Spron 510 Mainspring|
NH71A (skeleton, gilt)
|Day and Date||4R36A|
|Date, 24 Hour Subdial||4R37A|
|24 Hour Subdial||4R39A|
|Date by Pointer|