The quick answer.
Seiko Essentials Quartz SUR311 is a 40.2 mm everyday watch at $219.40. We recommend it for someone who wants a slim, legible black-dial watch on a steel bracelet, with sapphire and enough water resistance for everyday wear.
Why it belongs on the shortlist.
The SUR311 keeps the dial deliberately simple: baton markers, three hands and a framed date at three o’clock. The sunray finish gives the black dial some depth, and the steel bracelet lets it move between casual and smart-casual clothes without changing the watch’s character.
Our verdict: the easy black-dial daily.
This is the kind of Seiko that earns its place through proportion and restraint. The 40.2 mm case is only 8.36 mm thick, and the black dial, steel bracelet and date keep it familiar without looking generic. Sapphire and 100 m water resistance are welcome at this price.
A clean dial with the useful details.
Seiko describes a black dial with LumiBrite hands, applied markers and a date calendar. The hands and indices add a practical low-light detail without adding visual clutter; the sunray surface gives the black finish a subtle change in reflected light.
A slim case on steel.
The SUR311 measures 40.2 mm across, 8.36 mm thick and 20 mm between the lugs. Seiko does not publish its case length on the checked product page. If fit is the deciding factor, compare the diameter with a familiar watch and assess the bracelet length and clasp position for your wrist.
Buying it from Watches of America.
Watches of America lists SUR311 at $219.40; Seiko USA lists it at $265. Our supplied SEBASTIANBASSOL code is 10% off at the retailer, but it has not been tested on this exact reference. Confirm eligibility and the final total at checkout.
The details, at a glance.
- Reference
- SUR311
- Case diameter
- 40.2 mm
- Lug-to-lug
- Not published by the brand
- Thickness
- 8.36 mm
- Lug width
- 20 mm
- Case
- Stainless steel
- Crystal
- Sapphire
- Movement
- Seiko quartz Caliber 6N52 with date
- Water resistance
- Water-resistant to 10 bar (100 m)
- Strap / bracelet
- Stainless-steel bracelet with folding clasp
What draws us in
- Slim 8.36 mm case with sapphire crystal
- Black sunray dial, baton markers and a practical date
- Steel bracelet and 100 m water-resistance rating
Before you choose
It is a conventional quartz watch, so the appeal is its slim shape and low-fuss design rather than a mechanical movement or specialized complication. Seiko does not publish a case-length measurement on the checked page, so compare the 40.2 mm diameter and try the bracelet fit if that dimension matters to you.
Who it suits.
Someone who wants a slim, legible black-dial watch on a steel bracelet, with sapphire and enough water resistance for everyday wear.
When to choose something else.
Choose an automatic if you want a mechanical movement to wind and watch, or a rotating-bezel diver if you want a more overtly sporty design.
Warranty, returns and ownership.
Watches of America lists a one-year retailer warranty and a 30-day return window on eligible items; conditions and a restocking fee may apply. Seiko’s own warranty is described for purchases through its boutiques and authorized retailers, and the listing does not say whether it carries over here, so ask Watches of America to confirm in writing if manufacturer coverage matters to you. Shipping is listed as one to three business days with free shipping available.
Closest alternatives.
- Citizen NH8350-59L Automatic Blue Dial: A blue-dial Citizen automatic with a day-date if you want a mechanical movement and more dial detail.
- Tissot PR 100 Black: A black-dial Swiss quartz alternative with a steel bracelet and sapphire.
Think beyond the diameter.
The brand does not publish lug-to-lug for this reference, so use the case width, thickness and strap length to judge fit. Use our wrist-fit guide and compare the proportions with a watch you already enjoy wearing.
Watches of America partner code and offer terms. Our supplied code is SEBASTIANBASSOL for 10% off. Check the exact model and variant at the store, then confirm eligibility and the final total at checkout.
Where to buy.
Specifications and product photography: Seiko product page (checked October 20, 2026). Find Essentials Quartz SUR311 at Watches of America through our partner link and search for the selected option there. How we choose.
A few good questions.
What is the discount code for the Seiko Essentials Quartz SUR311?
The Watches of America discount code is SEBASTIANBASSOL for 10% off at watchesofamerica.com. We have not tested it on this exact model, so confirm the saving in your order summary. Every code and tested price: https://watchritual.com/promo/watches-of-america
How much is the Seiko Essentials Quartz SUR311 at Watches of America?
Watches of America listed SUR311 at $219.40 USD on October 20, 2026; Seiko USA lists it at $265. The supplied SEBASTIANBASSOL code is 10% off, but this exact reference has not been cart-tested, so confirm eligibility and the final total at checkout.
What size is the Seiko Essentials Quartz SUR311?
Seiko lists a 40.2 mm diameter, 8.36 mm thickness and 20 mm lug width. It does not publish a case-length measurement on the checked product page.
Does the Seiko Essentials Quartz SUR311 have sapphire crystal?
Yes. Seiko lists a sapphire crystal.
What movement does the Seiko Essentials Quartz SUR311 use?
It uses Seiko quartz Caliber 6N52 and has a date display.
