That is a newer piece. One which I think really shows the Vallein input.
The Strathearn Gallery which sold it, is just up the road from the Caithness Visitor Centre in the same village.
At the visitor centre, they do have an archive of old stock which they bring out and put on sale in limited amounts. It tends to be the rather more expensive serious limited edition works.
I have been studying the wording of the email from Dartington posted by Heart of Sklo.
This is it, for reference.
"The piece below is actually from Dartington Crystal, and sold under the now discontinued 'Innovate' range, which was manufactured in China and then imported to the UK. Sarah Peterson, who designs the Sandcast ranges was, at the time, employed and based at Dartington Crystal and developed this range, hence the similarity to the Caithness sandcasts which we now sell. Dartington bought Caithness in 2006, and it was at this point that Sarah moved back up to Scotland and started to manufacturer the items in their current form."
It is quite feasible from that wording, that they were only referring to the Innovate range which was made in China and then imported. Not the piece itself.
And if Sarah P was working at Dartington she could have made them there. It does say the piece is
from Dartington Crystal AND sold under thae innovate name.
It's not actually clear.