Prospex is a line of rugged sports watches from Seiko.
- "Built for the challenge"
Seiko has long produced serious tool watches for diving and military use. These were unified under the Prospex brand, with some falling under the Prospex Master and Prospex Dive sub-brands.
- SBDC - Automatic 200M diver, Cal. 6R15
- SKA - Kinetic diver, Cal. 5M62
- SNE - Solar diver, Cal. V157
- SRP - Automatic diver, Cal. 4R36
- SRPA - Automatic diver, Cal. 4R35/4R36
- SRPB - Automatic diver, Cal. 4R35/4R36
- SRPC - Automatic diver, Cal. 4R36
- SSC - Chronograph solar, Cal. V172/V195
- SSF - Chronograph solar, Cal. V192
- SSG - Chronograph radio-sync solar, Cal. 8B92
- SUN - Kinetic diver, Cal. 5M85
- Master Series
- Marinemaster Professional
- Sky Professional
- Superrunners EX
- Superrunners Solar
- Master Series (USA)