There are a number of shapes in both early and late levers...
With 81 (or 68) top you must have a 1936 and up lever...my rough measurement for fleamarket identification:
Measure from the flat top of the pivot ball to the very lower end of the lever.
1936 and up is4 7/8, early is 4 1/8.
Any stick working in a slanted tower should be early, any functioning in a vertical tower should be late.