ID this calculator

[aurelio]

(03-12-2021 08:01 PM)Eric Rechlin Wrote:  The 10bII (note the capitalization) had two different industrial designs, one from the ACO era and one from the post-ACO era; the later industrial design was retained for the 10bII+. This is the later design.

Forgive me all for my lack of knowledge, especially in calculators and english acronyma. Yesterday I've surfed on the web looking for ACO, and found here a lot of explanations, but probably not the right one. Erich can you help me, please, I'm quite lost