For the movement specialists…70s Austin acquisition question

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Howdy friends! As posted in WRUW, ebay find 1970s Austin Premier Automatic, Swiss Made, tritium hands, for the grand sum of $24.50. Any idea on the type of movement? ETA? AS? It doesn’t appear it has ever been touched internally to me.

This one will get a service, new crystal, and a new bracelet if Uncle has one that will fit. Lug width is a bit perplexing. Stated as 18mm in ad. It appears to be 20mm, but my 20mm strap is a tad too big. Probably will get a 19mm.
 
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Looks very much to be ETA based - there should be a number under the balance.