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Seiko Cocktail 'Mojito' 38mm Mens Watch
Ref. SRPE45J1
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Stepping up in the same colour and case shape
The SRPE45J1 belongs to Seiko's Presage Cocktail Time line, its design drawn from the mojito. The 38.5mm stainless steel case is fully polished and sits 11.8mm thick, with a 45.4mm lug-to-lug span. A box-shaped Hardlex crystal covers the dial, while a screw-down exhibition caseback reveals the movement beneath. The dial presents a gradient emerald green with a radial pressed gloss pattern, dressed with applied gold-tone Arabic numerals and split-finish hands — half-polished, half-brushed. A date window sits at three o'clock. The 4R35 automatic runs at 21,600vph with roughly 41 hours of power reserve and supports manual winding. Brown calfskin leather with a push-button deployment clasp completes the watch.
- Reference
- SRPE45J1
- Brand
- Seiko
- Collection
- Presage
- Case size
- 38.5mm
- Case thickness
- 11.8mm
- Lug width
- 20mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Green
- Crystal
- Hardlex
- Movement
- Automatic
- Calibre
- 4R35
- Functions
- Date
- Water resistance
- 50m
- Bracelet / strap
- Leather strap
- Strap colour
- Brown
- Clasp
- Three-fold clasp
- Retailer
- F.Hinds
Additional specifications
- Lug-to-lug
- 45.4mm
- Power reserve
- 41 hours
- Origin
- Made in Japan
Learn more about Seiko
Kintaro Hattori opened a watch and clock shop in Tokyo in 1881, aged twenty-one, and began manufacturing under the name Seikosha — roughly, house of exquisite workmanship — in 1892. The Seiko name appeared on watches from 1924.
The company's significance is that it broke the Swiss monopoly twice. First on precision: Seiko was appointed official timekeeper of the 1964 Tokyo Olympics and built the quartz chronometers and printing timers to do it, and in the 1960s its movements placed highly at the Neuchâtel and Geneva observatory trials against the best Swiss houses.
Then on technology. On Christmas Day 1969 Seiko released the Astron, the world's first quartz wristwatch, accurate to five seconds a month where mechanical watches managed that per day. The consequences for Switzerland were catastrophic — employment in the Swiss industry fell by roughly two-thirds over the following decade. Seiko deliberately did not enforce its quartz patents, allowing the technology to spread.
The same year it produced the 6139, among the first automatic chronographs, and it has since introduced Kinetic, Spring Drive — a hybrid regulating a mechanical mainspring electronically, giving a perfectly gliding seconds hand — and its own dive and field lines.
Seiko remains fully vertically integrated, making its own hairsprings, quartz crystals, and even the Zaratsu-polished cases, at price points from under a hundred pounds upward.
- 1881
- Kintaro Hattori opens his Tokyo shop.
- 1924
- The first watches carry the Seiko name.
- 1964
- Official timekeeper of the Tokyo Olympics.
- 1969
- The Astron becomes the first quartz wristwatch.
- 1999
- Spring Drive enters production.
Also in 7 collections
This watch appears in the Seiko Presage range (41), Back in Stock (3,616), Stainless Steel Watches (3,157), Automatic Watches (1,753), Leather Strap Watches (1,052), Dress Watches (555) and Green Dial Watches (436).
Temporarily out of stock
Mappin & Webb is not currently taking orders for this reference. Last listed as available on 9 September 2026. Stock is checked nightly and this page updates when it returns.
What the specifications mean
A mechanical watch for everyday wear.
Strengths
- 38.5mm suits most wrists
- 45.4mm lug-to-lug keeps the 38.5mm case wearable
Worth knowing
- 50m suits rain and handwashing, not swimming
Seiko Cocktail 'Mojito' alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | SRPE45J1 | NK5010-51L | T1584071604100 |
|---|---|---|---|
| Price | £400 | £399 | £408 |
| Case size | 38.5mm | 40mm | 40mm |
| Water resistance | 50m | 50m | 50m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Leather strap | Stainless steel bracelet | Leather strap |
| Power reserve | 41 hours | 60 hours | 80 hours |
| This watch |
|
|
Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Showering yes, swimming no. 50m covers splashes and brief immersion, but a swimming stroke generates well above the pressure that figure describes.
Water resistance explainedWill the glass scratch?
It resists most everyday knocks. Hardlex is a hardened mineral glass — tougher than standard mineral, softer than sapphire.
Sapphire, mineral and acrylic comparedDoes it need a battery?
No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.
Quartz, automatic and solar comparedHow long does it run for when it's not worn?
About 41 hours fully wound — enough to survive a night off the wrist, but not a full weekend.
What size strap does it take?
20mm. Any strap of that width will fit, and on most modern watches quick-release bars make the swap a two-minute job with no tools.
Will it fit my wrist?
Lug-to-lug is 45.4mm, which suits wrists from roughly 16cm (6¼ inches) upward.
Lug-to-lug decides fit more than case diameter does.
How to size a watch to your wristIs it a men's or women's watch?
Listed as men's, though at 38.5mm it sits in the range that suits anyone.
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