What Zenith model is this?

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I've got this recently but can not find any info what model is this, can fellow connaisseurs help me, please?
 
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Page 187 of Manfred Rossler's "Zenith Swiss Watch Manufacture Since 1865" book says the following:
"Rectangular men's wrist watch, about 1976, steel case, reference 01.0040.380, automatic, date, Calibre 2572 PC, lacquered face. (Zenith collection)" although the picture shows it on a leather strap rather than the bracelet. Hope this helps.
 
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Nothing on the case back? Maybe open it up and see if anything is inside the case back.