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Seiko Purchase Prospex HBB002K1
$755Stock unknown
Case
- Diameter
- 45mm
- Thickness
- 13.2mm
- Lug-to-lug
- 47.7mm
- Material
- Stainless Steel
- Water resistance
- 200m
Crystal & dial
- Crystal
- Sapphire
Movement
- Caliber
- Seiko 4R36
- Type
- Automatic
- Power reserve
- 41h
Seiko
Seiko's day-date automatic caliber and the in-house branded version of the NH36 with stricter quality control and finishing. The additional day wheel over the 4R35 adds the day-of-week complication without changing the movement dimensions. Found extensively in the Seiko 5 Sports and Prospex lines, it offers Seiko's proven reliability with the convenience of day-date display at a mainstream price point.
Market
Retail$755
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Retail stock & market context
Seiko on the secondhand market
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2026 so far · +6.1% to +17.3% · 91 matched watches
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Summary
The Seiko Purchase Prospex HBB002K1 is an automatic watch, with a 45mm stainless steel case, 13.2mm thick, powered by the Seiko 4R36 movement and a 41-hour power reserve. Water resistance is rated to 200m, under a sapphire crystal. Manufacturer MSRP is $755.
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