YB - Yellow and Black or Yellow/Black

Yowser Spinner: Yellow head with yellow and black tail, c. 1935. (Lure illustration from Heddon's 1935 catalog)

Tadpolly: Yellow body with black spine and black eyes. (Picture courtesy of Capt. Ron Kargol!)

Devil-Ace: Black body with yellow stripes on one side and yellow markings, yellow nose and yellow & black eyes. This is a catalogued color for this lure and dates to 1937-1939. (Pictures courtesy of Jim Viviano!)