Heirloom tools - what do you cherish most?

So I can imagine many of you have received tools passed down from parents or even grandparents etc. What did you get passed down to you? What is your most cherished heirloom tool? What will you leave behind to your own children etc?

A couple of ancient wooden spoke shaves with original blades, that work well, together with several hand made tools, made by my father, including an oiler, nut splitter for small nuts, and some wood saws, that when cleaned and sharpened out performed anything I’ve ever bought… oh, and an indestructible wooden tool chest that has travelled the world…

Grandpa left me his Shotwell handsaw.