From Mark Hill's book -Loch Heather and Peat, which includes a list of some engravers;
AS could be either Annabel Smith, or Alan Sutherland
CB could be Christine Beaton or Catherine Burns.
Highly recommend Mark's book if you have an interest in Caithness Glass.
And re Scotlands people website. From Frank's earlier post it seems they need financial support to get up and running again with a different host site - If everyone with an interest in Scottish Glass donated a few Euros I'm sure they could be viable again soon. A great loss!