Someone asked the same question a few years back.
Not sure it helps but suggests they could be OEM
https://www.retrobike.co.uk/threads/mavic-234-rims-info.353087/
Not exactly.Are they like S Club 7 ?
They sound fab,....Not exactly.
Harsh pre-techno Belgian electronic dance music. Renowned wearers of cycling shorts and welders' goggles.
He was a nice chap getting all this up (at the old site) , dates are on the market dates usually and not the model year.Mombat great for all things historical.Might not have the full technical breakdown of how they're constructed,and won't necessarily tell you which is better,but a great reference.
If you've never looked,the Shimano archive I've found particularly useful.
http://mombatbicycles.com/MOMBAT/BikeHistoryPages/Mavic.html