The lug work on both the BB and the fork crown are really interesting. I suspect that it might be a point of identification for someone who is an expert of japanese/Univega frames. There are a lot of things that point towards a high-end late 70s early 80s bike, including the cable guides. An interesting experiment is to try to see a. how much it weighs, b. what size post it takes, and c. whether a 700c wheel would fit ok with brakes, ...

as far as OA bath etc, it might make sense to either powercoat it or (preferably) take it to a car painter. They will sandblast it before painting anyways, so that would take care of the rust.