I guess they would have to be the ones Ron Webb acquired from Ruger back in the early 90's?
Ron was the only one to get hold of "virgin" red label monoblocs in Australia as far as I know.
Even the .375 flanged magnum which Jack Miller built, used a monobloc he obtained from Ron.
I remember that when Ron retired in the mid 90's, that most of his gunsmithing tools and stock ended up down in Tassie.

I always figured that you would have most likely ended up with some of that stuff Alex.

Would be nice to know what red label bits you have besides the monoblocs.