Military Watches
There is a special magic, an attraction to military watches issued back in the day. I haven been fascinated by these tools, built with a purpose, ever since I was issued one at the time of my service.
Here are some examples of classic, collectable pieces.

The US NAVY UDT Canteen

The WWII Clasic A-11

The british issued IWC

The ultra rare Tornek Rayville issued to US Navy UDT and USMC Force Recon

Benrus Type I issued to Special Operations

The Seikos used by the MACV-SOG during the Vietnam War

The amazing Royal Navy Rolex MilSub

The hardcore IDF issued Naval Commandos Eternal Super Kontiki

The Tudor of the French Marine Nationale
These are just a few examples. Some were purpose-built, some others were civilian watches repurposed for the harsh conditions of military use, however, they all have something in common: legibility and durability.
If you want to see what I call modern military watches, follow the compass here.