I bought this new a couple of months ago to connect my DV player to a Mac. It works perfectly and I no longer need it.
Apple Thunderbolt to FireWire + Thunderbolt 3 USB-C + 9 To 4 pin Sony Camcorder
Genuine Apple Thunderbolt to FireWire 800 Adapter Dongle A1463 - Sealed ????????
OFFICIAL GENUINE APPLE THUNDERBOLT TO FIREWIRE ADAPTER A1463 MD464ZM/A MD464LL/A
Genuine Apple Thunderbolt to FireWire 800 Adapter (A1463)–For Legacy Mac Devices
Genuine Apple Thunderbolt to FireWire Adapter - For MiniDV Video Capture (A1463)