Tap the image to enlarge
Seiko Cocktail Mockingbird 40.5mm Mens Watch
Ref. SRPD37J1
See more premium optionsHide
Stepping up in the same colour and case shape
The Cocktail Time series takes its cue from bartending rather than boardrooms — each model named after a drink, the dial colour chosen to match. The Mockingbird draws from tequila, mint liquor and lime, and the green it produces is no flat approximation: the dial is pressed with a sunray texture and finished under several layers of clear lacquer until it behaves less like paint and more like something lit from within. The curved Hardlex crystal above it is ground to a box profile that reads as vintage acrylic, softening what could have been a sharp modern edge. At 40.5mm across and 47.5mm lug to lug, this is a dress watch that actually fits the wrist rather than draping over it, and the downturned lugs hold the case flat without gap. The brown calfskin strap closes with a deployant clasp that threads the leather through a friction pin rather than punching holes in it — the strap will outlast what a standard buckle would do to it, and the push-button release makes daily use less fussy than it looks. The 4R35 inside hacks and hand-winds, which matters more than its modest status suggests: setting it precisely, and topping it up without waiting for the rotor to catch up, are habits that suit a watch worn for specific occasions rather than every day.
- Reference
- SRPD37J1
- Brand
- Seiko
- Collection
- PresageCase Size: 40
- Case size
- 40.5mm
- 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
- Lume
- LumiBrite
- Retailer
- Goldsmiths
Additional specifications
- Lug-to-lug
- 47.5mm
- Power reserve
- 41 hours
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.
Manufacturer’s guarantee
What the specifications mean
A mechanical watch for everyday wear.
Strengths
- 47.5mm lug-to-lug keeps the 40.5mm case wearable
- Luminous hands and markers for low light
Worth knowing
- 50m suits rain and handwashing, not swimming
Compare alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | SRPD37J1 |  RA-AR0009L30B |  NK5010-51L |
|---|---|---|---|
| Price | £380 | £365 | £399 |
| Case size | 40.5mm | 40.8mm | 40mm |
| Water resistance | 50m | 50m | 50m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Leather strap | Stainless steel bracelet | Stainless steel bracelet |
| Power reserve | 41 hours | 40 hours | 60 hours |
| This watch | Closely matched | Closely matched |
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.
Will the glass scratch?
It resists most everyday knocks. Hardlex is a hardened mineral glass — tougher than standard mineral, softer than sapphire.
Does it need a battery?
No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.
How 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 47.5mm, which suits wrists from roughly 16.5cm (6½ inches) upward.
Lug-to-lug decides fit more than case diameter does.
Is it a men's or women's watch?
Listed as men's.
Cheapest place to buy
Goldsmiths is the only UK retailer we track stocking this reference, so there is nothing to compare it against today.
Who are Goldsmiths?
Goldsmiths has been selling watches in Britain since 1778 and is part of the Watches of Switzerland Group, which is listed on the London Stock Exchange. They are an authorised dealer, so a watch comes with the manufacturer’s own warranty.
You may also like
In stock, and close on style and price
