For 1972-78 Johnson/Evinrude 3-cyl, 65-70 Hp outboards.
Hub uses key 47-01407
ID: 19.25 mm | OD: 91.5 mm
W: 25.4 mm | 6 blades

also crosses with:
Sierra: 18-3082
GLM: 89940
Mallory: 9-45213