CitizenSeries 8 870 Mechanical
A scale drawing from the manufacturer’s dimensions; the official photo is pending. Header: a Seiko 5 Sports, close up.
Indicative price band. The exact price is on Amazon.
See price on Amazon- The 0950 movement at 28,800 bph, resistant to magnetism, with Duratect-hardened steel and anti-reflective sapphire: Citizen’s high-end mechanics.
- 0950 movement with 50 h of power reserve at 28,800 bph.
- Hacking seconds and hand winding.
- Sapphire crystal and 100 m water resistance.
- 40 mm diameter, 11.7 mm thick and — lug-to-lug.
Affiliate link: if you buy, Amazon pays Calibrario a commission and you pay the same. Availability on Amazon.es checked on 21 October 2026.
In figures
Will it fit your wrist?
Move the slider to your wrist circumference. Seen from above, your wrist is roughly a third of that wide; if the lug-to-lug is wider, the watch overhangs.
With a 17 cm circumference, your wrist is about 56 mm wide.
Specifications
Movement
| Movement | 0950 |
|---|---|
| Movement maker | Citizen |
| Power reserve | 50 h |
| Beat rate | 28,800 bph |
| Hacking seconds | Yes |
| Hand winding | Yes |
Case and crystal
| Diameter | 40 mm |
|---|---|
| Thickness | 11.7 mm |
| Lug-to-lug | — |
| Case | Steel |
| Crystal | Sapphire |
| Water resistance | 100 m |
| Rotating bezel | Fixed octagonal bezel |
| Display caseback | Yes |
Strap and dial
| Lug width | Integrated |
|---|---|
| Strap or bracelet | Integrated steel bracelet |
| Dial | Blue |
| Complications | Date |
Buying
| Indicative price band | €880–950 |
|---|---|
| Style | Sports |
| Brand origin | Japan |
Data checked against the manufacturer’s official website on 21 October 2026. A dash means the manufacturer does not publish that figure.
Sources: citizenwatch.eu (archived copy), citizenwatch-global.com
The movement
Citizen’s high-end automatic: 28,800 beats per hour and resistance to magnetism.
Against its rivals
| Figure | Citizen Series 8 870 Mechanical | Seiko Presage Style 60's GMT | Citizen Series 8 880 GMT |
|---|---|---|---|
| Indicative price band | €880–950 | €600–660 | €1,200–1,290 |
| Movement | 0950 | 4R34 | 9054 |
| Power reserve | 50 h | 41 h | 50 h |
| Beat rate | 28,800 bph | 21,600 bph | 28,800 bph |
| Crystal | Sapphire | Hardlex | Sapphire |
| Water resistance | 100 m | 50 m | 100 m |
| Diameter | 40 mm | 40.8 mm | 41 mm |
| Thickness | 11.7 mm | 13 mm | — |
| Lug-to-lug | — | 47 mm | — |
| Hacking seconds | Yes | Yes | Yes |
| Hand winding | Yes | Yes | Yes |
| Rotating bezel | No | No | No |
| Strap or bracelet | Integrated steel bracelet | Leather strap | Steel bracelet |
| Brand origin | Japan | Japan | Japan |
| See price on AmazonSee specs | See price on AmazonSee specs | See price on AmazonSee specs |
Watches of the same style with the nearest price band. In red, the best figure in each row.
Comparisons
Making sense of the specs
Power reserveHow long it keeps running off the wrist, and why 80 hours changes daily life.Read the guide 
Sapphire, Hardlex or mineralWhich crystal scratches, which chips and which is worth it.Read the guide Frequently asked questions
Which movement does the Citizen Series 8 870 Mechanical use?
The 0950, from the Citizen 0950 family, made by Citizen. It gives 50 h of power reserve at 28,800 bph.
Does it have hacking seconds and hand winding?
The seconds hand stops when you pull the crown, and it can be wound by hand by turning it.
Can you swim or dive with it?
It is water resistant to 100 m: you can swim and shower with it, but it is not designed for scuba diving.
What size wrist does it suit?
There is no lug-to-lug figure for this model.