20mm Projectile possibly for Lahti?

This projectile came in a 20x138B German case but was loose so looks more like a 20mm Lahti projectile to me? It is original paint with unreadable white print on the side and a green band. It is 67.3mm long and has an iron drive band. Weight is 120 grams.
My Lahti’s all have coppery drive bands and a distinct mark 18mm above the band where this one is all smooth. 10mm from base to start of drive band.
All help on country of manufacture and cartridge that uses it is appreciated. Ron.

It looks like a Czech projectile


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It certainly looks like the ones shown in the link. The shorter projectile and green band did not look like German made. Thank you.