Quote:
Originally Posted by Kendras
Hard to say. Plain black is very unlikely.
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I agree
Quote:
Originally Posted by Kendras
Maybe plain red.
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Maybe

Look at the picture below portraying the nearby Tourelle du Chat:
You can see a coat of what looks like a solid red paint under the current black/yellow paintwork. Other lighthouses or day beacons with solid red or mostly red paint (possibly used as lateral marks):

Tourelle Richelieu (La Rochelle)

Tourelle des Vignettes (Saint-Nazaire)

Tourelle du Pignon (Rivière de Penerf estuary)
Quote:
Originally Posted by Kendras
Edit : But a red tower with a green light ? (from 1911)
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You are right, it makes little sense, unless the steady green light was replaced with something else on a later date...
Quote:
Originally Posted by Kendras
I don't think it was an isolated danger mark, else, they would have just added a simple buoy, and not built a whole concrete tower. 
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That's not so uncommon in especially dangerous areas, where the beacon and the light on top of it (if any) are better spotted from a longer distance than it is possible with an 'isolated danger' buoy:

Tourelle du Lavardin

Tourelle des Brillantes

Tourelle des Birvideaux

Tourelle du Soulard (Lorient)