I am going to guess (GUESS) that this is the Zephyr I.
Purely judging by the shape of the right hand pinky keys, fork F#, the G# trill and what appears to be "straight across" left hand C#/B/Bb keys (no Bb key touch underneath the C#/B key), and it still has the forked Eb.
Saxpics' classification makes 180xxx the break for Series II. This one has triple hook rings, ... probably double socket neck? That said ... seems to me there's a lot of BS around this stuff. With the right key heights and everything, likely a great sax. Whatever the model class.
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