Help me solve this Yamato/Ultimate wooden block puzzle - Puzzling Stack Exchange

I was recently at grandma's. Found this wooden puzzle her friend had made that I took apart as I thought it would be easy to put it back together. Turns out it was not. I have identified is as The

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Vtg Yamato Block Puzzle Wood Wooden with Instruction Sheet. See pictures for condition.

Vtg Yamato Block Puzzle Wood Wooden with Instruction Sheet, made in Japan

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