That French plate is next to worthless, it was only put there because by French law you lot need to have the vehicle weight displayed.
Body Numer Plate:
Style 62 = Model year 1962 (03/09/1961 - 26/09/1962)
4 = Buick
8 = Electra 225
67 = convertible
BL = Buick's Linden, New Jersey factory
1184 Production number
Trim 870-2 = Red leather/vinyl trim
Paint CC = Artic White/Artic White (upper and lower body colour)
The VIN plate from the door is a wee bit strange, because it's for a model year 1961 Electra 225:
8 = Electra 225
1 = Model year 1961
6 = Linden, New Jersey factory
022034 = Linden production number for model year 1961