Not quite a Seiko - but the Speedmaster is one the the 10 ultimate tool watches. A tool watch can be defined in many ways, of which mine is "a watch that looks good on a NATO-G10" (as issued to the British MOD, NATO stock number Army/Navy (6645-99-124-2986) & RAF (6645-99-527-7059)).
If anyone is considering NATOs I hope this will help you decide one way or another, but for daily wearing the standard issue 20mm admiralty grey NATO is sure hard to beat...
Standard issue 20mm admiralty grey
GasGasBones NASA-issue "Flight Qualified":
Travellers set - a NATO for all occasions!