MIYOTA/CITIZEN 90S5/9015 Hour Wheel

Quantity	Discount (%)	Price
1 - 2	—	$2.50
3 - 4	5 %	$2.38
5 - 9	7 %	$2.33
10 - 14	10 %	$2.25
15+	15 %	$2.13

Quantity

Discount (%)

Price

1 - 2

—

$2.50

3 - 4

5 %

$2.38

5 - 9

7 %

$2.33

10 - 14

10 %

$2.25

15+

15 %

$2.13

Product Description

Quantity	Discount (%)	Price
1 - 2	—	$2.50
3 - 4	5 %	$2.38
5 - 9	7 %	$2.33
10 - 14	10 %	$2.25
15+	15 %	$2.13

This is a genuine MIYOTA hour wheel for the 90S5/9015 movement, made in Japan, designed for 90S5/9015 premium automatic calibers. By engaging with the minute wheel, it transmits power to the hour hand at a 12:1 reduction ratio for 12-hour time display as a key component of the movement gear train. This product is brand new and original, not a generic replacement part.

Specifications

Brand：MIYOTA (by CITIZEN)

Compatible Movement：90S5 / 9015 premium automatic calibers (9000-series ultra-thin)

Part Name：Hour Wheel

Part Number：075-A51

Origin：Made in Japan

Quality：Genuine original, brand new

Function：Drives the hour hand (with 12:1 reduction ratio from the minute wheel)

Movement Size：11½ ligne (25.94mm)

Movement Height：3.90mm

Beat Rate：28,800 bph (4Hz)

Jewels：24

Hand Size Reference：Hour hand mounting hole 1.50–1.52mm

FAQ

1. Is this hour wheel an original CITIZEN/MIYOTA genuine part?
Yes. It is an original MIYOTA factory part with part number 075-A51, made in Japan.

2. What happens if the hour wheel is damaged?
A damaged hour wheel can cause the hour hand to stop, run incorrectly, or jam, affecting time readability. As it drives the hour hand at a 12:1 reduction ratio via the minute wheel, tooth precision directly impacts accuracy. Timely replacement is recommended upon detecting any abnormality.

3. Does this part come with installation tools or instructions?
No. This is a single component. Installation involves gear train disassembly and requires professional tools. Note that a copper washer is typically located beneath the hour wheel—ensure proper reassembly. Work should be performed by a qualified watchmaker.

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