Weird stuff! I have just double checked and below the "C" stamped on it is a small "b" so it could be trying to say C flat! But why would it do that when C flat is B? If is is B, it is only a bit flat of that so could be just down to an old tuning.I

Checking online and there does seem to be a scale of C flat but I don't know enough about music to know why :-(