I recently came across a bag in the attic owned by my grandpa who passed away last 2004. It was locked with a two-digit combination lock the likes of which I have never seen until then. I had it photographed below:

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Is anyone familiar with this kind of lock? I tried every possible two-digit combination, while flipping the small protruding "knob" up and down, yet it won't even budge.
I hope you could be of help.