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Hi Steven,
Please find new uploads to the Flickr stream as I'm taking the lens apart to secure the bayonet.
The rear group is marked "Ex Rapide" and B Darlot with a pencil. Hmmm ... A(lphonse)...

Anyone with information to share about this lens?
On the side of the Waterhouse slot, it's written:
"Extra-rapide
Portraits
Paysages
Reproductions
B D"
Two groups. Back seems a glued doublet....