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Seiko Prospex Sea SPB Date 40.5mm Ref:SPB143

Seiko Prospex Sea SPB Date 40.5mm

Reference: SPB143

★★★★★
★★★★★
4
2 ratings 2 reviews
The Seiko Prospex Sea SPB Date 40.5mm in silver and black is a dive watch released under the Prospex collection. In terms of construction this version features a 40.5mm and stainless steel case paired with a stainless steel band and sapphire crystal. The movement is an automatic Seiko reference 6R35. It has a power reserve of 70 hours and beats at a frequency of 21 600 beats per hour.

Essentials

Collection
Name
1965 Heritage Diver's Watch
Watch style
Crystal
Sapphire
Materials case
Stainless steel
Materials band
Stainless steel
Water resistance
200 m

Visuals

Case shape
Tonneau
Case diameter
40.5 mm
Case height
13.2 mm
Lug width
20 mm
Lug to lug
47.6 mm
Weight
180 g
Colors case
Silver, Black
Colors dial
Black
Colors band
Silver

Movement

Caliber
Seiko 6R35
Type
Automatic
Power reserve
70 hours
Frequency
21 600 bph / 3 Hz
No. of jewels
24
Complications
design
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2
movement
0
0
2
0
0
band
0
0
0
2
0
legibility
0
0
0
0
2
value
0
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2
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Your overall rating
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Variations

Brand - Seiko

From its inception, Seiko has been a trailblazer in horological innovation, consistently pushing the boundaries of what's possible in timekeeping. One of its groundbreaking achievements came in 1969 with the launch of the Seiko Astron, the world's first quartz watch, which revolutionized the market with its accuracy and reliability. Seiko has continued to innovate with the introduction of numerous groundbreaking technologies, including the Spring Drive movement, which combines the precision of a quartz watch with the craftsmanship of a mechanical timepiece. Moreover, Seiko has maintained its commitment to craftsmanship and quality, producing a diverse range of watches that cater to a wide spectrum of tastes and preferences, from classic dress watches to rugged dive watches. With a legacy of innovation and excellence spanning over a century, Seiko remains a driving force in the watchmaking world, revered for its technical prowess, reliability, and enduring style.

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Reviews

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media-libraryY2Sxbu Robin Page wrist 7.25"/18.42cm
★★★★★
★★★★★
May 24, 2025

Built as a modern day successor to the original skin diver, the Seiko 62MAS, the SPB143 is a compact, slim, skin diver style watch with a silvery sunburst dial paired to a black bezel. The SPB143 is a dive watch that has grown on me with time, and I would argue it handles better than it photographs. 

Specc'd satisfactorily (but not mind blowing) for the price, the SPB143 has a 70 hour power reserve, a pleasingly crisp and smooth 120 click bezel, and some nice polished highlights to compliment the predominantly brushed case. While the squared off interface between the case and bracelet isn't my favourite, it is faithful to the original watch it is based on and I think the more diehard enthusiasts would have rioted if Seiko had changed it. In a wave of recent retro re-issues, with this watch Seiko has some serious history and design cred to draw from and does a good job of preserving that in a modern format.

The main challenge Seiko faces with this watch is internal competition: compared to the more budget divers in Seiko's own line up, on paper the SPB143 offers a sapphire crystal and bump in power reserve compared to watches like the Turtle, Samurai or 5kx but asks for double or even triple the rrp in return. When handled in person the difference in build quality and finishing is more pronounced than you may think between the SPB143 and its more affordable stablemates, but in an increasingly digital marketplace where both entry level and premium options have the same name on the dial it can be hard to stand apart. 

If you're considering the SPB143 I would recommend trying it on in person. On paper it feels underwhelming, but in person it makes a lot more sense. To give you an idea of how well this watch fills the vintage skin diver role, I cross shopped the SPB143 with a Tudor BB58 and while I ended up purchasing the Tudor, the fact the SPB143 was in the running at all for a third of the rrp of the Tudor should tell you all you need to know.

media-libraryYGDoNA Chad wrist 6.50"/16.51cm
★★★★★
★★★★★
May 15, 2025

This is a Seiko diver that goes beyond your expectations. Although limited to 6,000 pieces, you can easily find them for sale online. Don't let the pictures mislead you; the white dial is actually more silver with a sunburst. The bezel looks black but turns blue in bright light. The bezel action is great with good tactile feedback. Fits well on my 6.5 inch wrist. I've got mine on a bracelet from Uncle Seiko.