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Illustrations and extensive description of the items listed below can be seen in Dennis Laney's definitive Leica 1984 Accessory Guide courtesy of Mike Butkus

Leica Code Description Production Year Remarks
QBOOE Yellow filter no. 3 dense; screw-on type H ca.1935 NY item
QCPOO Yellow filter no. 3 dense; slip-on type A36 ca.1931 NY item