I've been studying Raoul Serres for a bit and came across this puzzling query about the 1942 airmail stamps issued in the French territories, most of which fall under the Vichy issues (well, according to Gibbons anyway). There is a story in the "France & Colonies Philatelist" of May/June 1946 stating that originally, only a 100f Senegal airmail stamp was planned. This was engraved by Pierre Munier.
Then, it was decided to issue the design in all French territories, thereby making it necessary to change the original engraving, which had the country name included in the design. So a new die was made without country name and a few other minor changes. Again, done by Pierre Munier.
Then the decision to issue stamps in all territories was rescinded and so only the original Senegal stamp was issued. Only a few die proofs exist of the second die by Munier.

But there are several similar stamps issued in all the French territories as well, with the name of Raoul Serres as the engraver! No mention of this in the aforementioned magazine. So I presume that later still it was decided once again to
do use the design for the other territories as well.

Fine by me but now I need to know which ones are of the Serres die and which ones are from the Munier design. I have a feeling Munier only did the Senegal 100f stamp and all the others may well have been by Serres, but I'd like to know for certain (or at least, as certain as possible).

So: do you have any of these stamps, and if so can you add pics so we can establish which ones were done by which? I think the complete list of territories involved is as follows:
Dahomey
French Guiana
French Guinea
French Sudan
Indo-China
Ivory Coast
Madagascar
New Caledonia
Niger
Réunion
Senegal
Togo
And of course remains to find out why they asked another engraver to do a whole new (?, it looks like the Serres enrgaving has much more lines in the sky, but these are just pics of the internet and the Munier one especially is not very good) engraving when they already had an engraving without country name which they could have used. Or could the Serres engraving just be a reworking of the orignal Munier die? But then it's a bit cheeky to have the name change on the stamp. Mmhh.
So: any info and (better) pics are more than welcome!