Lemme guess it’s a Crane toilet. They had a huge class action suit with the insurance industry years ago because of this. Happens with other makes, but Crane toilets from 1980-95 are bad news. Source: I used to be a PM on insurance claim repairs.
Not sure whose it is? Probably American standard?
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If it’s a Crane it’ll be marked on the base just back from the seat. I happens to all toilets but Crane had a manufacturing defect that went unnoticed for a while.