why do you think that this is not a dalmore blue/TOS combination stone? as you probably know, these combos do exist, and then there are dalmore blue stones that do not have the nice swirls these stones are known for. i have a big labelled one that looks exactly like yours, except for the spots, but with the sparkling particles, no swirls. i may post a few pictures, if i can find them...
best regards,
hans