I have an MSR stove that's seen many mountaineering expeditions over 25 years and melted down gallons of snow water. But my personal favourite is my Optimus Hiker. I've had it for almost 40 years and it has a certain iconic position amongst my camping impedimenta.

Mine has the original brass fuel tank (lovingly polished with Brasso) and the tin box has been repainted with heat-resistant silver paint many times. It is dented and worn from a hundred adventures (once falling down a cliff!). It is heavy, but it is my friend. We have a warm relationship, older than any other single piece of gear. On my bike, it has boiled many a pot of pasta and brewed a thousand cups of tea. It has seen the wilds of Alaska, Yukon and Northern BC.

It will be in my will.

Edit: It occurs to me that my Optimus is actually the old "8R" model, featured in this video. I also have the mini priming pump (which should not be left in place during operation).