This green filter is equivalent to a #61 (deep green) plus a #16 (yellow-orange) filter. It is used for making separation positives from color negatives. Also, used in making three-color printing on color paper.
Most Kodak gelatin filters are available in 3 x 3" (75 x 75mm), 4 x 4" (100 x 100mm), 6 x 6" (150 x 150mm), and 14 x 18" (350 x 450mm).