WW1, 1917 dated German Becker (20x70 RB) Aircraft Cannon HE Round

WW1, 1917 dated German Becker (20x70 RB) aircraft cannon HE round. The Becker round was the forerunner for the Oerlikon 20 mm FF, FFL and FFS series of aircraft cannon rounds used during WW2. Brass case with head stamp ' P & S 17 Sp61 ' and a contact fuse also dated 1917 and marked ' 135 U ' but missing initiator plunger. Good, clean condition. Scarce.
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Code: 11015