There are six meanings shown in OED's entry for your noun masthead, two of that happen to be labelled obsolete. See ‘Which means & use’ for definitions, use, and quotation evidence. As their reliance on both of these mottoes demonstrates, colonial Anglo-American newspapers created strikingly very little work to differentiate https://reallivesocial.com/story2380102/the-smart-trick-of-masthead-that-no-one-is-discussing