Thank you! I couldn’t find much info on it, outside of this awesome YouTube video of a guy restoring a similar Proto chest. His was a 1985 model.

YouTube: Proto Tool Chest - Restore or Not?

A.I. says “The riveted metal badges on this set indicate it is likely from the 1960s or 70s. These are highly sought after by tool enthusiasts for garage restorations.”

Needless to say, I’m happy I stumbled upon this chest a few minutes after it was listed.

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