Yup. J-70 was 1934 J-75 1935 J-80 was 1936. In 1936 and 1937 they made the 100 and 110 that used the same powerhead as the J motors but has an underwater exhaust and thermo-syphon cooling instead of the piston pump.
Kev
110 on the left J 80 on the right:
