Specifications
- Movement
- Seiko 4R36, automatic with hand winding
- Accuracy
- +45 to -35 sec/day
- Case diameter
- 38.0 mm
- Lug-to-lug
- 44.2 mm
- Thickness
- 12.3 mm
- Case
- Stainless steel, see-through case back
- Crystal
- Hardlex
- Water resistance
- 100 m
- Magnetic resistance
- Magnetic resistant
- Weight
- 77 g
- Strap
- Silicone
- Band length (max)
- 210 mm
- Lume
- LumiBrite on hands, index(es) and bezel
- Dial
- Orange
- Features
- LIMITED EDITION on the case back, See-through & Screw case back, Serial number on the case back, Unidirectional rotating bezel
- Released
- 2026-08
- Series
- Seiko 5 Sports, SKX series
Other watches on the 4R36
Questions
What movement is in the Seiko HDB013?
The HDB013 runs on the Seiko 4R36, an automatic movement that can also be wound by hand. See the 4R36 page for its specs and every watch built on it.
Does the Seiko HDB013 have a sapphire crystal?
No. The HDB013 has a Hardlex crystal. Hardlex is Seiko's hardened mineral glass: tougher than plain mineral glass, softer than sapphire.
How water resistant is the Seiko HDB013?
100 m (10 bar). That covers swimming and snorkelling; it is not a certified diver's watch unless Seiko says so.