Studio made back-up credentials for Inspector Lewis Erskine played by the late Efrem Zimbalist Jr.
If you know your TV history, The then FBI Director J. Edgar Hoover liked this show so much that he allowed them to use real FBI Identification as hero props. These were taken away after filming each episode by the Agents attached to production. Like most productions the studio had to have back-ups for re-filming, continuity etc. These are one such set.
The Real hero ones are still with the FBI, a second set is with a museum and these are the only other set I have seen.
I have had them mounted in a custom case to closely match the museum ones, given to Efrem by the Society of Former Special Agents of the FBI and look like a FBI Retirement Plaque.