ROBO JR RED Vintage Rolling Knife Sharpener Very RareU.S. PAT #2,469,797.

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ROBO JR RED Vintage Rolling Knife Sharpener Very RareU.S. PAT #2,469,797.:
$5.00

ROBO JR RED Vintage Rolling Knife Sharpener! Very Rare!U.S. PAT #2,469,797.
I came across this in a box of old items that was given to me. I had never seen one before. Definitely been used and often. But I see no cracks or chips. I have no idea how it works but it looks like a pretty cool little gadget...lol.