The many different case variations of the Longines Sei Tacche and Tre Tacche is intriguing.
Those steel cases are works of art and your MN is a tremendously beautiful example.
I do have two Movado Calatrava variations on my way from a dealer- one with a wide flat bezel reminiscent of the Patek ref.96 case (Who knows? Maybe it actually is the same case since Taubert made the case for the 96 as well as many cases for Movado) as well as one with a stepped case design. Really anticipating their arrival.