Upvote:0
As for the material of the frame, it's celluloid. I don't know when the technique for this sort of striped fake-ivory celluloid arrived, but I have found references to "Ivory Pyralin" which usually means the striped variant of celluloid from 1913. It also fell out of favor in the 1940's as it's extremely flammable.
"Ivorish" could mean it's some sort of bone.
Upvote:4
At that time there were tons of institutions called "Notre Dame", so it is pretty hard to find.
According to French Wikipedia, first communion was at age 7-8 in 1910. Not sure about before, but that might be from a Γ©cole Γ©lΓ©mentaire (or the equivalent at that time).
Your best bet is to find similar anchors in this list of city blasons, and check whether each city had a "Notre Dame" school.
The city of Berck has a anchor in its blason, and has a school+college named Notre Dame. There might be others.