The first one is a Deepstar (non-balanced piston first stage).
It was around in the early 70’s, but I think it was introduced in the late 60’s. It was a very common low end regulator. Several of my high school buddies used to dive it.
The Deepstar was replaced by the Aquarius, but I think there was some overlap of when they were available.
The best way to confirm the approximate availability dates is to download the US Divers catalogs from the down load section. I say approximate, because many items were available before and sometimes long after they were shown in the catalogs.
The Deepstar in particular is one regulator that I think that was available (probably from the distributors, but maybe even from USD) for a long time after it might have disappeared from the catalogs and was replaced by the Aquarius. I just remember having them both available for sale about the same time period.
The Calypso second stage is an older style second stage, I think mid to early 60’s. This can be easily confirmed from the catalogs. I would look it up, but I downloaded them at home, not here.
Neither one is a Conshelf, but they did share the same second stage.
Buceador con escafandra autónoma clásica.