United Hotels Yale Key Bronze Fob Return Grand Central Station

Here is a neat United Hotels Yale brass room key (room 710) of a New York City hotel with a bronze fob. The fob is marked "RETURN TO PO BOX 505 GRAND CENTRAL STATION NYC" and "IF CARRIED AWAY PLEASE DROP IN ANY MAILBOX WE GUARANTEE POSTAGE" The iron s-link is rusted and has stained the key, but otherwise the set is in good condition.