Seiko NH35A VS Miyota 9015

	Seiko Caliber NH35A	Miyota Caliber 9015
Year Introduced	~2011	2009
Type	Automatic	Automatic
Lignes	12”’	11.5”’
Diameter	27.4mm	26mm
Height	5.32mm	3.9mm
Jewels	24	24
Vibrations Per Hour	21,600 bph	28,800 bph
Power Reserve	41+ hours	42 hours
Accuracy	-20~+40 sec/day	-10~+30 sec/day
Lift Angle	53 degrees	51 degrees
Hacking?	Yes	Yes
Hand-Windable?	Yes	Yes
Date?	Yes	Yes
Hand Size	1.5mm/1.0mm/0.21mm	1.52mm/1.0mm/0.17mm
Anti-Shock Protection	Diashock	Parashock
Country of Manufacture	Japan or Malaysia	Japan
	Buy	Buy

Differences are in red

Seiko caliber NH35A VS Miyota caliber 9015

When comparing the NH35A and 9015, it is important to note that these are two of the most popular non-Swiss automatic movements. Both movements are made in Japan, while some NH35A movements are also made in Malaysia. Both calibers are considered to be workhorse movements and are found in many affordable microbrand/crowdfunded watches.

Beat Rate:

With all of the differences between these two calibers, the most dramatic difference is the beat rate. The Seiko NH35A beats at 21,600 bph, whereas the Miyota 9015 beats at a higher 28,800 bph.

Complications:

Both the Seiko NH35A and Miyota 9015 have a quick set date.

Crown Position Functions:

The Seiko NH35A and Miyota 9015 have similar time setting functionality.

0 (against the case): Manual Winding
1 (pulled out one click): Date setting
2 (pulled out two clicks): Time setting

Rotor Winding Direction:

The Seiko NH35A is equipped with Seiko’s own Magic Lever, so the rotor winds the mainspring in both directions (bi-directional). The Miyota 9015 rotor winds in clockwise direction only.

Interchangeability:

The NH35A and 9015 measure up with a slightly different diameter and height. These two movements are not meant to be swapped, and although an experienced watchmaker can possibly pull of an NH35A/9015 mod, it would depend on the application and would not be worth the amount of work needed.

Replacement Prices:

This may surprise most readers, but compared to the Seiko caliber NH35A, the Miyota 9015 costs more than double. The NH35A can be found in the range of $35 – 45 USD. The 9015 can be found in the range of $100 – 135 USD.

Additional Resources:

• Seiko caliber NH35A page
• Miyota caliber 9015 page