Ours was first too! I always thought theirs was first - since it opened first. But close examination of the two plaques proved different.
Shake, Rattle & Roll - Serial Number 26731
Cedar Point Troika - Serial Number 26732
So ours was apparently made first.
I am proud to say that not only have I been on two Troikas - I have been on two HUSS rides with consecutive Serial Numbers!