Interesting... If you're right that the other Hannah (b. 1726) died, then this can't be the Hannah Cliff/Calef who married Daniel Pegg.Your information states that Hannah Calef who married Godfrey Smith was born in 1742; well, from my information Hannah (Cliff) Pegg had her first child ca. 1740.
I do, however, notice that Godfrey Smith Jr. died in Philadelphia, which is where Daniel Pegg lived.
Is it certain that the first Hannah died?I know that it wouldn't be common to have a second child with the same name as an earlier child unless the earlier child had died, but that seems to be the only way this could possibly be correct.