Yes, a "museum piece" from days of old ... Telecom/Telstra wired telephone connectors from the 60x series
Made right here in Australia (Sydney) by Jackson Industries
TELEPHONE DOUBLE ADAPTER SOCKET
Circa early 1990's (prior to the manufacturers number having a 9 prefix added)
Type 605 male plug ~ 2x Type 610 female sockets
Body identifications
Socket end: AUSTEL PERMIT C87/01A/0024
Topside: (Jackson Industries logo)
AUSTRALIAN DESIGN
REGISTRATION NO.102541
02.899.8933 (their old phone number)
COSMETIC CONDITION:
USED
Clean
NO damage to the body
NO damage to the fingers at either end
Completely sealed, you cannot get inside this one
Now stored in a clear plastic sealed packet
USED
Exactly as described