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Seiko Conceptual SSB345P1 Watch
The Seiko Conceptual SSB345P1 is a quartz chronograph with the 8T63 calibre, a fixed tachymeter bezel, and a blue dial. The stainless steel case with high-hardness coating measures 43.9 mm in diameter, 12.9 mm thick, and 51.1 mm lug-to-lug, with a weight of 173 g. It features Hardlex crystal, 10 bar (100 metres) water resistance, and a 22 mm steel bracelet that tapers to 20 mm.
The 8T63 calibre is quartz, with a declared accuracy of ±15 seconds per month and a battery life of approximately 3 years. The chronograph measures up to 60 minutes in 1/5-second increments, with a central seconds hand, a 24-hour hand, and a small seconds subdial at 6. The date sits between 4 and 5, and the bezel features a fixed tachymeter scale to calculate average speed from the chronographed time.
The blue dial has three subdials: the one at 3 for the 24-hour hand, the one at 6 for the running seconds, and the one at 9 for the chronograph minutes. The chronograph hand and some dial details are in orange, a contrast Seiko uses to make chronograph reading quick. The tachymeter bezel does not rotate: it is a fixed engraved scale.
The tachymeter on this SSB345P1 is not a rotating dive bezel: it is a fixed scale engraved on the bezel. When you chronograph the time between two kilometre points, the chronograph hand points directly to the average speed on the scale. No app or GPS needed: you press the top button, stop at the second point, and read the result. It is a chronograph built to measure, not to decorate the wrist.
The watch weighs 173 g and mounts a steel bracelet with folded links made to look solid and hollow end links. The clasp is a triple-fold with push-button release. The case back is screw-down and the crown is pull and push, not screw-down. It is not a limited edition: it is a regular production model from the Conceptual line.
1/5 s Chronograph Fixed Tachymeter 8T63 Calibre Hardlex Crystal 100 Metres 173 g
Why choose this watch?
Fixed tachymeter bezel, not rotating
It is not a diver and does not pretend to be. The bezel does not move: the tachymeter scale is engraved and serves to read average speed with the chronograph. Anyone looking for a dive bezel will not find it here.
43.9 mm and 173 g of presence
It is not a discreet watch. The case and bracelet are noticeable on the wrist, and the 51.1 mm lug-to-lug calls for a medium or large wrist. On small wrists it overhangs.
Three subdials with orange contrast
The blue dial organises the three chronograph readings into separate subdials, and the orange details help identify the chronograph hand without confusion. It is functional reading, not decoration.
Hardlex and 100 m: daily use without diving
Hardlex crystal handles daily wear but is not sapphire. The 100 m cover rain, hand washing, and surface swimming, not immersion. It is a sporty dress chronograph, not a diving instrument.
Folded-link bracelet
It is Seiko's economy bracelet: folded links made to look solid and hollow end links. It does the job, but anyone expecting a solid high-end bracelet will be disappointed. The clasp is a triple-fold with push-button release.
Technical specifications
Movement and functions
- Type: quartz.
- Calibre: Seiko 8T63.
- Accuracy: ±15 seconds per month.
- Battery life: approximately 3 years.
- Functions: hours, minutes, seconds, date, 24-hour hand, small seconds, and chronograph.
- Chronograph: up to 60 minutes in 1/5-second increments.
- Subdials: 24 hours at 3, running seconds at 6, chronograph minutes at 9.
Case and dimensions
- Reference: SSB345P1.
- Brand: Seiko.
- Collection: Conceptual (Neo Sports).
- Case material: stainless steel with high-hardness coating.
- Diameter: 43.9 mm.
- Thickness: 12.9 mm.
- Lug-to-lug: 51.1 mm.
- Weight: 173 g.
- Crown: pull and push, not screw-down.
- Case back: screw-down.
- Water resistance: 10 bar (100 metres).
Dial, crystal, and bezel
- Crystal: Hardlex.
- Dial: blue.
- LumiBrite: hands and indices.
- Bezel: fixed tachymeter.
- Calendar: date between 4 and 5.
Bracelet and presentation
- Bracelet material: stainless steel.
- Width: 22 mm, tapering to 20 mm.
- Links: folded with solid finish. Hollow end links.
- Clasp: triple-fold with push-button release.
Frequently asked questions
Can the tachymeter bezel be rotated?
No. It is a fixed bezel. The tachymeter is engraved and does not move. To calculate speed, you use the chronograph and read directly on the scale.
Is the crystal sapphire?
No. It is Hardlex, a mineral crystal hardened by Seiko. It is resistant to daily scratches but does not reach the hardness of sapphire.
Can you swim with it?
Yes. It has 100 metres of water resistance (10 bar), enough for surface swimming and light water use. But the crown is not screw-down, so it is not designed for diving or for pressing the buttons underwater.
Does the chronograph measure tenths of a second?
Yes. The chronograph measures up to 60 minutes in 1/5-second (0.2-second) increments. It is the typical precision of Seiko quartz chronographs.
Is it a heavy watch for daily wear?
Yes, it is substantial. At 173 g with a 43.9 mm case, it is noticeable on the wrist. The steel bracelet and 12.9 mm thickness give it presence. On small wrists it may feel large.
What is the high-hardness coating on the case?
It is a surface treatment Seiko applies to stainless steel to increase its resistance to scratches and daily wear. It does not change the colour or shine of the steel, and it is not a plating of another metal: it is a hardened layer that protects the surface. The case remains stainless steel, but treated to last longer.
