When I was about 9 or 10, a friend of mine and I went to the auto-repair shop that my another friend's dad owned. A car with a dented door and a broken windshield was there to be fixed and we kids were there just to collect the broken glass scattered around the vehicle. Those blueish 1cm-square pieces of windshield glass looked beautiful to my eyes. I think I had a thing for glass as a kid.
This petite green jar, about 7cm tall, makes me feel a little nostalgic.
It must be for storing food.
Spice? Dried herb? Sugar cubes?
I'm thinking powdered yuzu or shichimi.
On the bottom it says "Czechoslovak".