Well,
Joe Seifert from Norton Motors once told me the original colours back in the seventies were made by Metalflake.
The original paint was rather a gelcoat on the glassfibre tanks and sidecovers of the early Commandos
https://www.metalflakecorp.com/metalflake-metalflake.html
There is no RAL Number or this paint as far as I know.
A friend of mine has a paintshop and painted my 1970 Commando in "Fireflake Royal Blue" with an old jar from Glasurit from the eigthies.
Unfortunatly I had a little crash and the tanks has a dent on the right side and ther is no more pint left.
So he showed me a paint chart from House of Kolors with several flake paints.
You can choose the size of the flakes.Small or medium is the best.
They are sprayed over a base coat and sealed with several coats of clear coat.
So a very labour intensive and costly paintjob.
Here you see my blue Commando ( painted) and a friend´s purple Commando with
original glassfibre tank and gelcoat. The flakes are barely seen from that distance, only when you get closer.
Good luck !
Uli
BTW: My friend is looking for a right hand side cover in Fireflake Roman Purple, gelcoated and not repainted...