Reference "American Genius - Most commonly made as a stand-alone lock, approximately thirty examples of Isham's Key Register lock remain".
An advert in 1868-69 for the Isham Key Register Bank Lock claims " The Stock Exchange and Safe Deposit vaults in New York City are now using 418 of this lock"
If the lock on the Williamsburgh Savings Bank vault is an Isham then add +1 to the total known.
Patent.