For 1951-57/1962-73 Johnson/Evinrude 2-cyl, 25-40 Hp outboards.
Hub uses key 47-01407
ID: 19.05 mm | OD: 69.85 mm
W: 12.7 mm | 6 blades

also crosses with:
Sierra: 18-3006
GLM: 89480, 89470
Mallory: 9-45217