My first camera was my dad's Nikkormat FTn. I don't use it so much any more, but before being used constantly by me as a teenager, it was used by my sister as a teenager. If that's enough for you, nearly 20 years ago, it survive a swim in the ocean. It still has salt stains on the shutter curtains, but it has never worked any less than perfectly.
I now have another indestructible camera, the RB67. When we have nothing better to do, my dad and I debate which we would rather be cornered in a dark alley with, the RB for it's brute force, or the Nikkormat for it's better maneuverability.