Jan-- Very nice photos of the bus, and they clearly show how accurately the French Meccano factory made it. My own example, bought back in 1959 or so from H.Hudson Dobson, was very chipped when I bought it. I always assumed it was maybe leftover stock that never sold and was stored improperly. I still have it, but not nearly as pristine as your very nice example.
Regards, Terry

Hi everybody.

My contribution : two versions :  with gridded  or smooth ceiling.

Richard