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NH Movement Rotor - GS 9SA5 - Blue
$47 SGD
The movement, dressed. GS 9SA5 in blue. Seen through the caseback.
A decorated rotor turns the one moving part you see through an exhibition caseback — the weight that swings as you wear the watch — into the finished centrepiece of the movement.
This is a drop-in NH movement rotor — GS 9SA5, finished in blue by PVD (physical vapour deposition), so the colour is part of the metal's surface, not a layer of paint that can chip or peel.
Swapping it is the simplest mod there is — a single screw, no movement surgery, no watchmaker.
One screw. Two minutes.
You're not opening the movement — just trading the bare oscillating weight for a decorated one.
Seen through the caseback.
The rotor is the first thing the eye lands on behind an exhibition sapphire — the part that moves. Decorate it and the whole movement reads as considered.
PVD, not paint.
The blue is laid down by physical vapour deposition — bonded into the surface, not brushed on. It won't flake, and it can't be stripped back to bare steel.
A two-minute mod.
It seats on the rotor post and holds with a single screw. No movement disassembly, no special tools, no risk to the calibre.
Built for the NH family.
Machined to Seiko's OEM rotor geometry — 0.15mm thicker to carry the CNC decoration — and tested to fit the full NH, 4R and 7S automatic line.
To see it, you'll want
An exhibition caseback. A decorated rotor only shows behind a sapphire (exhibition) caseback — a solid steel caseback hides the movement entirely.
A matching bridge. For the complete look, pair the rotor with a decorated NH movement bridge in the same finish.
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Finish & Build
- Quality Swiss Production Quality, ISO 9001 Certified
- Finish GS 9SA5 · Blue · PVD coating
- Construction 0.15mm thicker than the Seiko OEM rotor, to carry the CNC decoration
Compatibility
- Fit Movements 7S26, 7S36, 4R15, 4R35, 4R36, 6R15, NE15, NH25, NH26, NH34, NH35, NH36, NH37, NH38, NH39, NH70, NH71, NH72
- Caseback Exhibition (sapphire) caseback required to display
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To allow for CNC decoration, the decorated rotor is 0.15mm thicker than the Seiko OEM rotor. Each rotor is tested to fit all our bridges, cases and casebacks.
Below is Seiko's technical drawing . As long as the case and caseback follow Seiko's OEM specification — a 0.4mm gap between the rotor and caseback — the rotor fits. If those parts deviate from Seiko OEM dimensions, the rotor may be incompatible.
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- 1x NH Movement Rotor
All photos of watches with modification parts are for illustration purposes only and are not included with modification parts purchased.
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Fitting a rotor is the easiest mod there is:
- Unscrew the existing rotor screw with a 2–3mm flat screwdriver and lift the old rotor off.
- Seat the decorated rotor on the post.
- Screw it back down — done.
New to modding? Start with Seiko Modding: The Complete Build Guide , or browse NH Movements to build around it.
Questions, Answered
Everything worth knowing before you build.
Will a decorated rotor fit my movement?
Do I need an exhibition caseback to see the rotor?
Is the finish paint? Will it wear off?
Why is the decorated rotor slightly thicker than a stock Seiko rotor?
Is fitting a decorated rotor difficult?
Customers praised this blue skeletonized rotor for adding visual appeal to watch movements with exhibition case backs. Reviews highlighted "perfect fitment" and "excellent quality" construction. Shoppers appreciated the elegant pop of color it provides, easy installation, and GS-inspired design. Fast shipping and included screwdriver were noted positively.
- Perfect little pop of color. The quality is excellent, and fitting was easy and quick.
- Perfect fitment! Just the right amount of color for my 4R36
- This rotor really adds to the look. Finally a reason for the clear case back!
Color (positive)Design (positive)Fitment (positive)Movement (positive)Rotor (positive)
F
Using this mod part for: SKX013 based custom build
Very easy upgrade on a NH34 that give a touch of elegance to the movement. This rotor is very well made, in the spirit of GS.
Once again, Adriel's products are awesome. And its business is very serious. Buyers : don't hesitate a second.
K
Using this mod part for: 36mmGS case
Perfect part to top off a build I've been thinking about for months. Great quality.
J
Using this mod part for: aftermarket case sub style 40mm + jubilee
Very nice product which fits perfectly. What is awesome is that you get the specific screwdriver to mod it which i didn't expect. Thank you a lot ! Arrived faster than expected. 10/10 Very happy.
J
Absolute great rotor! Adds so much to the look of the movement! Great buy!
D
Using this mod part for: Srpe
This rotor really adds to the look of my srpe. Finally a reason for the clear case back!
R
Using this mod part for: SRPD65
Perfect fitment! Just the right amount of color for my 4R36
D
Using this mod part for: SRPE53
I added the blue skeletonized rotor to my subtly modded DressKX and it gives it the perfect little pop of color on the backside that I wanted. The quality of the rotor is excellent, and fitting it to the movement was easy and quick.
T
Using this mod part for: Aftermarket case
The rotor feels solid in the hand and the colour is fantastic. I don’t really notice the words on the rotor when I look at it in person and this is good for me.
It arrived a day before expected and was packaged phenomenally.
My favourite watch mod store because I know I can always trust the products and service.
E
Using this mod part for: Aftermarket
Excellent alternative rotor. The color matches the blued screws I use.
A
Using this mod part for: SNKF615K1
I purchased this rotor in order to modify a SNK615. Adriel shipped the order in order time and shipping might be managed in the best way I have seen.
The rotor is a very, very close resemblance to an actual GS rotor (which is really an achievement).
Lucius is the best supplier of mod parts I have seen and will keep doing business with them.
R
Using this mod part for: SKX007
What an addition to my build. Really visually sets of the movement. Customizes the movement as well. Such Ana awesome look.
Well designed and manufactured!
Great shop as well. Received hand written not from them!
Highly recommended on all accounts!
G
Using this mod part for: SRPD53
Very well made and just gives the movement that extra pop in the exhibition back. Highly recommended
