I'm guessing that it's made of bronze
That´s the big joker in the deck, i had to go look at it to know what you were talking about, and the way it´s depicted MAY suggest that it´s actually a wooden bell...
Reason for this suspicion is due to how it´s depicted, metal bells rarely have the kind of bindings that the pictures show, and it seems somewhat similar to some old wooden buddhist style bells i´ve seen.
Sadly, internet searching for pictures at best only comes up with a few fairly small wood bells from some Californian mission, and those are not very similar at all.
Anyway, if metal, most likely bronze yes.
https://www.youtube.com/watch?v=L83XAgsl_Gg116 ton...
so I'm wondering what bells like Great Paul are made of
Weirdly, i can´t actually find a good source that specifies material for it...
Bronze is implied though.