Rarest MoPar I've ever seen
I found the answer on internet and it's not specific to RHD Barracuda's.
It's a standard 1967-69 Plymouth Valiant/signet cluster (not Dart).
In 1970 the gauges became round but the cluster remained the same, except for the flasher location which has been moved on the steering column.
EDIT : Sorry, I am wrong. It's a specific RHD cluster : gauges and lights/wipers switches are the same, but the surrounding bezel is left/right inverted.