Sorry that this is going to come across like me being a dick, but some of the folk's knowledge here is downright disappointing
Especially given the fact no correcting info was provided :\\
Zosma Chips ARE PRODUCED, but are 100% OEM only (HP are the only ones I've seen sell systems with them)
Phenom II X4 840T, E0 Stepping, 2.9GHz/3.2T (unlocked shows up as "Phenom II X6 1405T")
Phenom II X4 960T, E0 Stepping, 3.0GHz/3.4T (unlocked shows up as "Phenom II X6 1605T")
Phenom II X4 970 BE, E0 Stepping, 3.5GHz (HDZ970FBK4DGR chips)
Chances to unlock are almost certain. The 840T and 960T are now pretty easy to find on eBay through a certain reseller, but the prices (while fair) are not worth it. I'll admit though, it'd be cool to have one, and I almost got a hold of one (through a friend). Seems the test systems never got pulled though, so no dice, and I run a 1090T now anyways.
The X6 1035T and 1045T are the OEM Thuban-based models offered.
While unrelated (to Thuban/Zosma), there is also another odd-duck that I came across on AMD's business/industrial section: Phenom II X4 XLT Q54L. It's a low thermal solution, running at only 2.2GHz. It has an Athlon II XLT sibling also, models V50L, V60L, V66C. All are Regor based (so native dual core) and run 2.2, 2.7 and 2.8GHz (respectfully).
All of this is backed up by CPU-World.com if you're interested.
As for the OP, my theory is: perhaps the original 1055T that were 125W variants ACC-unlock to "BE" models under the 1050T moniker