Mavic wheel info please

Luke98

Retro Newbie
I recently acquired a pair of mavic rimmed wheels. The rear wheel has a flanged "Normandy" hub and mavic monthlery route rim. The front has a non flanged atom hub on a mavic championnal du monde sur route rim. I have a few questions about them which I was hoping someone here could answer.

Is it unusual for a wheel set to have different hubs? And is there a reason someone may have done so?

Are the two different rims high quality? And is it normal for them to be mixed and matched?

Does any one know roughly what era these rims are from?

Thanks in advance for any help
 
I doubt it's a wheel set just individual wheels used on the bike previously
 
Re:

The wheels could be 1960s, decent rims on cheap hubs.
I would not have wanted to build them like that, but financial constraints were probably involved, or just odd parts pressed into use.

Keith
 
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