It’s probably galvanized steel which people still use. Copper is common where I live as is aluminum but it wouldn’t be weird to see galvanized steel either.
Most likely the roofing people replaced with like material where possible. That’s a fairly common choice on old homes, unless the old material is unsafe, not good, or impossible to source.
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Confirmed, 1908 craftsman :) The roof is 20 years old, maybe that’s when the switch to aluminum started?
It’s probably galvanized steel which people still use. Copper is common where I live as is aluminum but it wouldn’t be weird to see galvanized steel either.
Most likely the roofing people replaced with like material where possible. That’s a fairly common choice on old homes, unless the old material is unsafe, not good, or impossible to source.