^^ Might not help you as I doubt you peeps on the other side of the world have heard of it, but its a Hypersonic C60 RDM. It was an Aussie thing.
Quite old, by the sticker it looks to be made in Triana like many, so its basically the same as many 5-10 y/o RDMs.

Its CC, and works absolutely perfectly in my 2017 6.4 Gaastra Cross (first year they dumped the hard top and went to CC)

That's why I was going to go one size bigger in a Gaastra- but the two biggest sizes for the cross sail (6.7 and 7.2) specify SDM. Bloody stupid to specify the whole range on RDM then the biggest on the SAME LENGTH mast but suddenly it's SDM.

OTOH as sandman said his Gator says 430SDM for the 7.0 but his 430 RDM works fine..... I will just rig one and see...... One Simmer, one Gaastra, one Severne....

If you remove the Severne SDM cam and replace with an RDM cam, you need to remove one spacer.

NP Ryde HD every Ryde rigs on a 430 from 5.5 to 7.5 so 7.0 Ryde HD maybe? Freeride sail may not suit your wave sailing but is my go here in Sydney to get wet.

I don't know why the Gaastra wouldn't work on an RDM. Have you asked Gaastra?