Seiko Speedtimer HBC003 / HBC004 — short spec
Short overview, not a review. Pros and cons restate published facts only. No buying advice. Numbers not shown on a source we opened are omitted or marked unpublished.
Seiko’s Prospex Speedtimer references HBC003J1 and HBC004J1 share a 39.5 mm case, 44.5 mm lug-to-lug, and 12.0 mm thickness. Both Singapore pages list calibre 6R55, about 72 hours, and 20 bar. HBC003J1 is the bracelet. HBC004J1 is cow leather.
Verified specs
| Item | Published | Source |
|---|---|---|
| References | HBC003J1 bracelet. HBC004J1 cow leather. The case figures match. | Seiko Singapore product pages |
| Case | Diameter 39.5 mm; lug-to-lug 44.5 mm; thickness 12.0 mm; 20 mm between the lugs; crown at 4 o’clock; curved sapphire, anti-reflective on the inner surface; super hard coating | Seiko Singapore product pages |
| Movement | Calibre 6R55; +25 to −15 seconds a day; approximately 72 hours; 24 jewels; stop seconds | Seiko Singapore product pages |
| Other | LumiBrite (glow-in-the-dark paint) on the hands and indexes; inner countdown ring; three-fold clasp on the bracelet; magnetic resistance 4,800 A/m (ampere per metre); water resistance 20 bar | Seiko Singapore product pages |
| Singapore price | SGD 1,417.00 for HBC003J1. SGD 1,362.50 for HBC004J1. | Seiko Singapore product pages |
Fit on 6–7 in wrists (6.5 in reference)
Fit: Moderate risk on a 6.5 in wrist. The 44.5 mm lug-to-lug and the 12.0 mm thickness are on the Seiko Singapore pages for HBC003J1 and HBC004J1.
The flat top of the wrist (usable span) is the width a watch can sit on without its lugs hanging over the edge.
| Wrist (approx.) | Seiko lug to lug | Thickness | Fit note |
|---|---|---|---|
| 6.0 in (152 mm) | 44.5 mm | 12.0 mm | Moderate risk: 44.5 mm is close to the flat top of a 6 in wrist (44.63 mm before rounding). |
| 6.5 in (165 mm) — reference | 44.5 mm | 12.0 mm | Moderate risk: 44.5 mm is just over 90% of the flat top of a 6.5 in wrist (about 48.3 mm). |
| 7.0 in (178 mm) | 44.5 mm | 12.0 mm | Low risk: 44.5 mm is under 90% of the flat top of a 7 in wrist (about 52.1 mm). |
Short overview
Pros (from published facts)
- 39.5 mm wide, 44.5 mm lug-to-lug, and 12.0 mm thick.
- Calibre 6R55, approximately 72 hours.
- Water resistance 20 bar.
Singapore note
The authorised dealers guide lists Seiko boutiques at JEM, Takashimaya, and VivoCity, and about 70 points of sale. It names salons at All Watches (Bugis), Watches of Switzerland CAPSULE (Jewel), Gassan and Time Emporium (Changi), and also Vincent Watch, Star Watches, City Chain, H2 Hub, Mustafa Centre, Red Army Watches, Gnomon, and more. Watches are not subject to customs duty in the usual consumer path (see Buying in Singapore).