I've seen this mark several times but not found who it belongs to. From what I can tell it is a 1990's to now manufacturer. The reason there is no expected TD-65 type mark is that those are for individuals, not companies.
ATI, CII and a few others I can't remember all mark similarly. They are often misidentified as pre-1948 due to the absence of an eagle mark or the post 79 mark but they are very new.