For the real-world prototype of this Paris bus Somua Panhard I came across a much better photo than before, with a more similar roof box, be it in black and white.
I also refer to my (and others') elaborate contribution(s) on the talkmodeltoys webforum, in the French Public Transport division, the 29d thread.
Kind regards, Jan
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
-105c and 383 4-Wheel Hand Truck (1949-1958)
-105c and 383 4-Wheel Hand Truck (1949-1958)
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--22c Motor Truck (1933-50)
--22c Motor Truck (1933-50)
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Trailer Caravans
Trailer Caravans
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Trailer Caravans
Trailer Caravans
-138 Hillman Imp (1963-73)
-537 Renault 16 TL
-189 Triumph Herald Saloon (1959-64)
-255 Mersey Tunnel Police Van (1955-61)
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-189 Triumph Herald Saloon (1959-64)
-189 Triumph Herald Saloon (1959-64)
-674 Austin Champ (1954-71)