Longines Admiral Octagon Case - Vintage

Hi, I'm asking for some help here as I found very little information online about this 1970s vintage Longines Admiral Octagon Case Chronometer Ref.2330-1.

I found one in NOS conditions and I got curious about this model, which sports one of those quintessentially 1970s "block" type case. Would anyone know any more about this watch? Perhaps some happy owner?

Any pointers on potential market value would also be appreciated.

Thanks a lot,

M