One card of each pair is preprinted in colours, the other is all or partly to to be coloured by the purchaser. (Tuck also produced books of this kind, eg of national flags.) In the complete books by Ramel I have seen for sale the purchasers seem to have done a remarkably good job, so it is maybe pot luck which one you get when you buy a single card. The booklets were printed by Ch. Courmont Paris, presumably a successor to Courmont Frères (qv).
During WW1 Ramel also produced illustrated Patriotic cards, actual stand-alone postcards.
In the early 1920s Ramel published a series of cards with illustrations of flowers by Lily Giry. These have the cockerell logo in the stamp box. The logo on the picture side is just plain letters, see the example. Ramel also issued these in booklets with perforations, though perhaps aimed at collectors as the cards in the booklets have no print on the reverse of the pictures.
A few publishers have used a cockerel in their logo. Others represented here are Gallia, Paris, G LECOCQ, Amiens and an unidentified publisher
Ramel also published booklets of tranfers (decals), probably in the 1920s. I haven't yet found any cards with the CHANTE-CLAIR logo.
A few odd things about the first card. The written date looks like 1912 but the postmark and the visée line confirm it was 1917, So why does the printed heading have the line about some foreign countries? This went out before 1910. It turns out that lots of French cards kept this heading years after it no longer applied.
Next page, a bigger collection of examples