Suunto Core All Black - My buddy got it for me a few Years ago. Super dependable. Needs a battery annually. It's seen U.S., Germany, Romania, Iceland, Mexico, Kuwait, and Syria. :
Amazon.com: Replacement Battery Kit For suunto with O-Ring and Battery for Advizor/X-Lander / Vector / Altimax / Yachtsm : Health & Household
DIY SUUNTO CORE BATTERY CHANGE - YouTube
Suunto Core : Replacing the Battery - YouTube
low battery indicator | WatchUSeek Watch Forums
Watch Accessories Battery Cover Waterproof Ring Watch For Suunto Core Watch Bottom Cover Watch Parts - Watchbands - AliExpress