TRO: 3055U explicitly mentions the following as military exports:
Koto (Mercs)
Copperhead (DCMS)
Tsunami (Mercs)
Sasquatch (WoB, rumored)
Many Solaris mechs indicate production in the single digits (or even a single example). The VEST-produced designs especially are largely hand-built.
Weren't the Copperhead and Sasquatch VEST designs?
By the way, though perhaps I'm wrong but the Sasquatch both original and later variants (like the one with the large left arm held shield) seem way under armed for an 80 ton assault 'mech.
I'll add this:
From what I can see it seems almost all 'mechs built for the Solaris games are under armed when compared to comparable tonnage regular military machines. It could be that without the need for long range weapons in most Solaris matches that those are simply not mounted and thus it makest the 'mechs seem to be more weakly armed.