classic motorcycle forum

I got these wheels off of my dad, which he took off of a custom chopped honda cb750. He insists that that are original honda wheels, but they have no identifying logos or text on them. Also, i could not find any pictures anywhere of any standard honda cb750s with similar rims. This has lead me to believe that they are from a differrent motorcycle and i was wondering if anyone knew the original bike they are from?

P.S - the hole in the edge of the rear rim is not original and has been added after for a side facing valve, and the original inwards facing hole has been welded up.