These cables were manufactured by Mohawk/CDT, their part number VDC-C5. They are from unused spares stock.
This part number is listed as a Betacam dubbing cable.
This cable is listed as an equivalent to the Sony VDC-C Series Cables, but that is uncomfirmed.
They use what appear to be Hirose male & Female Miniature 12-Pin Connectors.
Note that there is a single Keyway and the internal ring is 15mm in diameter.
Equivalent replacement cables are selling for over $200!