In closed are pictures of a fairly hard to find at least on this side of the pond a 20x70RB Becker cannon shell. The shell on the right for comparison is a 20x82 the Luftwaffe's standard aircraft cannon round from 1941 to the end of the war. I'm not familiar with 20mm Becker markings and hope I can get some information. I checked out all the measurements and they seem to check out OK for a 20mm Becker with incendary projectile.
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