The drawing for Design 32/1B specifically drawn for the battleship USS Iowa (BB-61) has not yet been found. Norfolk Navy Yard sent the Bureau of Ships on January 13, 1944, photostat copies of the pattern applied to BB-61. Iowa must have used those drawings for Design 32/1B and Iowa was photographed in 32/1B in early 1944. The specified vertical colors in this drawing were navy blue (5-N) and haze gray (5-H). Iowa's application of 1B is a very good match to this drawing.
This is the only Design 1B drawing yet found.
Original drawing source: Supplement to Ships-2 March 1943 Plate XXIV.