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6 of the Best 40mm Seiko Watches: Buying Guide

40mm seiko watches

Seiko is a brand that always delivers quality, security and strength. And, when it comes to taste, it is up to you to choose what you like best. All attributes that can come across your mind can be found in 40mm Seiko watches, whether they cost $100 or $1,000.

So even if you need a wristwatch of exceptional elegance or some everyday timepiece, Seiko has your back.

Even when you are in a dilemma about which watch to buy, you will never go wrong with this Japanese brand because tradition, beauty, and high quality are on their side.

For an in-depth article about Seiko, I would highly recommend you read: Seiko takes on the World: Japanese Dragon vs Swiss Monopoly

Due to this, we selected 6 Seiko watches with a 40 mm diameter and below to suit every wrist. Let’s check each one of them and find the one that suits your style!

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1. Seiko Men’s SNK807 SEIKO 5 Automatic

Why do we like it? – It comes in different colours, so it’s easy to find your favourite one. Also, the price and quality ratio is better than we expected.

We can all agree that Seiko 5 watch models are as eternal as diamonds. This particular model, SNK807, is ideal for sports enthusiasts. 


The watch has a steel grey round case with a blue display and a blue canvas bracelet. Normally the bracelet is available in different colours, so you can find the one that suits your taste. 

It features fluorescent sword-shaped pointers with the company logo above the centre. However, the SNK807 has a stationary bezel function rather than a bidirectional rotating bezel made of stainless steel and a case-back skeleton.

This Seiko SNK807 has a case diameter of 37 mm and a thickness of 11 mm. In addition, its bracelet is 24 cm long and 18 mm wide; all of this gives security and strength to one sports watch.

This analog watch weighs only 36 grams and has automatic movement. As for water resistance, it can withstand 30 meters of water depth or about 99 feet. 

Besides these features, this timepiece also has a calendar month and day at 3 o’clock. Seiko sports watches are always interesting, but it is necessary to their specifications because there are a variety of watches Seiko can offer. 

Our advice to you is that you will never go wrong with this model because the ratio of quality and price is excellent, while tradition delivers security and beauty.

2. Seiko SPB123 Prospex Limited Edition Alpinist

Why do we like it?  – Besides being one of the company’s most popular models, this watch is just perfectly crafted between beauty and quality, 

The Seiko SPB123 is a combination of elegance, beauty, and sporty endurance. It exudes a phenomenal design with stainless steel case, automatic updated 6R35 movement. It features an upgraded automatic mechanism that falls into limited editions.

Seiko SPB123

This model made for mountaineering appeared in 2020 and became a cult watch of the Prospex series. The round shape and analogue display give this watch an amazing design that you will proudly wear.

The Alpinist watch is one of the most advanced ones since you can easily jump from Alpinist equipment into an informal suit for dinner.

The case diameter of this watch is 39.5 mm, while the case thickness is 13.2 mm housed in stainless steel. Thanks to the calfskin bracelet, the timepiece is crafted for exceptional durability. 

Seiko SPB123 has the dial window material made of anti-reflective sapphire crystal and a magnifier with dial colour off-white. In front of 3 o’clock, there is a very visible date thanks to the magnifying glass.

This Alpinist watch has a band in silver colour made of stainless steel as well as a bezel which is in fact a rotating compass inner ring. Such a feature is important for those who are serious about hiking. 

When it comes to water resistance it can withstand up to 650 feet or 200m, which is incredible. As for the price, the watch costs between $675 – $950 depending on where you buy, which falls into the high-end category. 

However, even though this timepiece is slightly more expensive, it gives you the value of a Seiko Prospex series that is always a pride to wear.

3.  Seiko Men’s SNK803 SEIKO 5 Automatic

Why do we like it? Strength and endurance of the Seiko 5.

This is another real beauty from the Seiko 5 series, which resembles our first watch. Seiko SNK803 is a great choice for everyday wear in nature or the office, on a light sports day, or shopping. 

In addition to the easy change of bracelets, which comes in different colours, this watch has a hardlex mineral crystal dial that is strong and scratch-resistant. 


The beige colour of the dial gives it a gentle elegance and the possibility of fashion detail. While on the other hand, the stainless steel case gives strength and power for adventure.

The watch features black numbers and fluorescent hands framed in black, arrow-shaped form. All of this gives this timepiece a transparent look and visibility. 

SNK803 model was created in 2017, with a steel housing, a diameter of 37 mm, a thickness of 11 mm, and a men’s standard band size width of 18 millimetres. It also has a band material canvas with a clasp buckle. 

The stationary bezel function made of steel gives this watch the beauty of simplicity. Day and month boxes are standardly placed at 3 o’clock, while the water resistance is 30 m or 99 feet.

When it comes to the weight of the watch, it is 26 grams heavy and powered by an automatic Seiko movement. 

Seiko gives you a great value-for-money ratio, and as for this timepiece, you will want to prepare about $140, which is more than worth it since it’s Seiko 5 collection.

4. Grand Seiko Elegance GMT SBGM21

Why do we like it? – Because it exudes the perfect combination of beauty and elegance.

A classic combined with incredible elegance, this Grand Seiko Elegance GMT SBGM21 reveals royalty, masculinity, willpower, and sophistication. Everything on this watch points to the solemnity, beauty, and significance of the moment.

Seiko GMT SBGM22

This watch has an ivory dial colour and glass-coated anti-reflective sapphire crystal. The company logo is placed just below the 24 o’clock with the silver hands and a different yet unobtrusive bluish second hand.

Seiko has a round shape with an analog display, a 19mm wide band made of crocodile skin brown colour. GMT SBGM21 shows its strength through stainless steel cases 39.5mm in diameter and 13.7mm thick. 

Watch shows its endurance thanks to the power reserve of 72 hours. The Grand Seiko series has a date number on the three o’clock and a dual time display function. With 35 jewels feature, this watch exudes elegance, plus it is splashproof and magnetically resistant, which is always a big plus.

It is easy to fall in love with this watch and the elegance provided by the Seiko brand. Despite the higher price, which is around $5,000 you get a lot, and above all, the beauty, quality, Japanese precision, and accuracy. 

5. Seiko SUR363 Men’s Japanese Quartz Dress Watch 

Why do we like it? – Totally different from the other mentioned watches, with stainless steel bracelet and amazing attention to detail. 

Another great timepiece that we are deliberately presenting. This little yet very impact watch came in 2021; thus, it falls under the new collection. The Seiko SUR363 is a little gem of traditional Japanese elegance. 

Seiko SUR363

One of our favourite features is the gold-coloured hour marker with fluorescent hands framed in gold on a black dial.

This watch has a beautiful combination of the delicate silver bracelet with two gold lines that break the monotony and deliver sophistication to this watch. It can be a beautiful fashion detail on festive occasions, and it will surely provoke the envy of colleagues in the office.

Seiko SUR 363 is round in shape with window scratch-resistant hardlex crystal. The case material is also crafted of stainless steel with a 40mm diameter and thickness of 12mm in silver tone. 

It is also stainless steel with a 10mm width and a push-button deployment clasp when it comes to band material. The watch is also water-resistant, up to 100 meters or 330 feet in depth. 

Seiko SUR363 unobtrusiveness shows your attitude and sophistication as suitable for almost any occasion. And, with an affordable price of around $200, you can get the watch of your dreams.

6. Seiko SKX013K2 Black Dial Automatic Watch

Why do we like it? – Great choice for extreme sports, very durable, and excellent price for its value.

If you want to be noticed on the street or on the beach, then the Seiko model SKX013K2 is your watch. This diving model captivates with its strength and extremely sporty spirit. 

Seiko SKX013K2 1

The watch is silver in colour with a black dial and a marathon runner’s heart powered by a Seiko calibre 7S26 automatic mechanism. It also features a 40-hour power reserve which is amazing and has 21 jewels for a glowy appearance.

This analogue timepiece has a round shape, stainless steel case material, 36 millimetres case diameter, and 20 millimetres thickness. When it comes to its band, it is a silver colour with 25 millimetres in width.

Seiko SKX013K2 came in 2017, which might be a little older; however, this model never runs out of style. The watch is also water-resistant, up to 200 meters or 650 feet, making this timepiece an incredible dive watch. 

When it comes to the price, this model can be found at around $950, which is pretty affordable since it is a very durable and sturdy watch.


Seiko’s brand exudes quality, tradition, and great prices. When it comes to tastes, everyone can find a timepiece to suit their needs and style as well.

These six 40mm Seiko watches, including both sporty and elegant ones, are great for people with smaller wrists. However, even those with a little thicker wrist can find their match. It is all thanks to Seiko’s incredible design and attention to detail that each and every watch-enthusiasts will appreciate.  

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