BelArgUSA
Thanks for letting me in on your secret source of information.
I have lurked there. Fear not, I used stealth, least I unwittingly tip off OBL.
Interestingly, whilst there I discovered something of great import.
BelArgUSA, has the wrong end of the stick.
Class A airspace starts at 18,000ft, so any mandated speed restriction below 10,000 is hardly relevant. However the definition does go on to say that Class A extends " in designated international airspace beyond 12 nautical miles of the coast of the 48 contiguous States and Alaska within areas of domestic radio navigational signal or ATC radar coverage, and within which domestic procedures are applied.
The answer to my question which I have determined through your benevolence, is that the speed restriction would apply in Class B airpace as far out over the water as the airspace is designated B, regardless of the 12 mile bit.
Now I just have to determine how far out it goes. Back to the charts.
Thanks
Maui