Seiko’s newest limited-edition Prospex divers are accented with signature "Seiko Blue"

Seiko is turning 145 this year, and the company is celebrating this milestone by launching a slew of special edition watches across its Prospex, Astron, and Presage lineups. We have already seen the Astron HAB004 Anniversary edition and the likes of Prospex Speedtimer SRQ059 and King Seiko SJE121. Now, the Japanese watchmaker has announced two new limited edition dive watches: the Prospex HBB001 and Prospex HBC005.

Both of these models are incredibly clean, but the real star of the show here is “Seiko Blue.” It’s a signature, deep blue hue that’s been baked into the brand’s identity since the 1960s. On the HBB001, it makes for a super fun dual-tone rotating bezel. On the HBC005, that same blue hits the unidirectional bezel and seconds hand, creating a brilliant contrast against a crisp, silver-white dial.

The Seiko HBC005 is the more premium and powerful of the duo, featuring a Caliber 6R55 automatic movement that delivers an impressive 72-hour power reserve. Its 40mm stainless steel case draws inspiration from Japan’s very first diver’s watch released in 1965, embodying an iconic yet compact style. Being a dive watch, the HBC005 also offers 300 meters of water resistance.

The Prospex HBB001, on the other hand, features a slightly larger 41.7mm stainless steel case. It's powered by the Caliber 4R35 automatic movement, boasting an approximate 41-hour power reserve. Its 200 meters of water resistance is a step down from the HBC005, but then again, the HBB001 is also roughly $800 cheaper.

Pricing & Availability

The Seiko Prospex HBC005 and HBB001 are scheduled to go on sale in the US, Japan, the UK, Australia, and Europe in June. The pricing in various markets is as follows:

• HBC005 (limited to 4,000 units worldwide)
  • US: $1,400
  • Japan: ¥192,500
  • UK: £1,300
  • Europe: €1,500
  • Australia: AUD 2,200

• HBB001 (limited to 9,999 pieces worldwide
  • US: $595
  • Japan: ¥83,600
  • UK: £560
  • Europe: €650
  • Australia: AUD 950

Seiko Prospex HBC005 Specifications

• Movement: Caliber 6R55 automatic (manual winding supported)
• Power Reserve: Approximately 72 hours
• Accuracy: +25 / -15 seconds per day
• Jewels: 24
• Case Material: Stainless steel
• Case Size: 40mm diameter × 13mm thickness × 46.4mm lug-to-lug
• Crystal: Curved sapphire crystal with inner anti-reflective coating
• Bracelet: Stainless steel bracelet with three-fold clasp, secure lock, push-button release, and slide adjuster
• Water Resistance: 300m / 1,000ft
• Magnetic Resistance: 4,800 A/m
• Lume: LumiBrite on hands, indices, and bezel
• Bezel: Unidirectional rotating bezel
• Crown: Screw-down crown
• Case Back: Screw case back with limited-edition engraving
• Lug Width: 20mm
• Edition Size: Limited to 4,000 pieces

Seiko Prospex HBB001 Specifications

• Movement: Caliber 4R35 automatic (manual winding supported)
• Power Reserve: Approximately 41 hours
• Jewels: 23
• Functions: Date display, stop seconds hand function
• Case Material: Stainless steel
• Case Size: 41.7mm diameter × 12.3mm thickness × 49.5mm lug-to-lug
• Crystal: Hardlex mineral crystal
• Bracelet: Stainless steel bracelet with three-fold clasp, secure lock, push-button release, and extender
• Water Resistance: 200m / 660ft
• Magnetic Resistance: 4,800 A/m
• Weight: 170g
• Lume: LumiBrite on hands, indices, and bezel
• Bezel: Unidirectional rotating bezel
• Crown: Screw-down crown
• Case Back: Screw case back with limited-edition engraving
• Lug Width: 20mm
• Edition Size: Limited to 9,999 pieces