steering stem nut orientation on a pre 71 commando. which way up

Do you mean this one? The wide side (left on photo) goes toward the top steering crown (down).
steering stem nut orientation on a pre 71 commando. which way up
 
When a fastener has a radius added about the hex, it's for the purpose of snag reduction (polishing cloth, flesh, esthetics, etc.)
steering stem nut orientation on a pre 71 commando. which way up


So orientation is obvious.

Rare specialty fasteners (sleeve gear sprocket) also obvious, to match the mating surface.
 
Also If the pre71 commando has a locking tab washer for that nut, it would function better bending it against the sharp edge of the nut
Edit: I don't see a locking tab washer listed in the parts diagram so this post is irrelevant. Sorry
 
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