Legitimate piece, late 1950's movement, as you have discerned. Case and dial original. Looks identical to model 2671 at vintagewatchresources.com. I have seen these now and then. Yours looks to be barely used and in good shape. The 23z movement looks pristine and is a nice, reliable, movement. Longines produced all manner of different designs for the American market in the 50's and 60's, and this is a nice example. Love the linen-style dial.
Click to expand...