These certainly look like Salk HT3s to me. They're good, and if the price is right, they would be a steal. They were once the top of the Salk line.
They're large (12" W × 15" D × 40" H) and heavy, 87 lbs. each. Bring some help if you want to take them home.
Also, it might be possible to remove the plynths under the cabinets. On my Salk speakers, the plynth is held on by four large lag screws with ½" hexagonal heads. They're in recessed holes under the plynth, so I needed a ratchet wrench with a ½" socket. It is also possible that, once you remove the screws, those plynths can't easily be pulled off without damaging their finish.
I can't see the tweeter clearly enough, but it's possible those HT3s are an older version that had an Aurum Cantus ribbon tweeter. Not to worry, in a 3-way design like the HT3, that tweeter worked well. But it wasn't used in a 2-way design. At a later time, Salk started using the RAAL ribbons instead.
If
@D Murphy sees this thread, maybe he could tell which tweeters are in those HT3s.