. However, "Katty Angels in the World" does not appear to be an official series or high-quality guide related to horology or this specific timepiece. If you are looking for a high-quality guide for the Seiko SSK001 , here is the essential information for enthusiasts: Seiko 5 Sports GMT (SSK001) Guide

Title: The Phenomenon of SSK-001 Katty: Angels in the World and the Quest for High Quality

What Sets the SSK 001 Apart

Research Findings

Legibility: The black dial features LumiBrite on the hands and markers, providing excellent low-light visibility.

Water Resistance: Rated for 10 bar (100 meters), making it suitable for swimming but not for scuba diving.