This is a ultra rare Longines Ultra-Chron 38mm monobloc case watch.
 
It is all original & in stunning condition just check the brushing on the front of the case & that mint bullring Gold dial, it's a stunner and I have only seen one of these with this 38mm monobloc square case.
 
It has it's original Longines bracelet, crown etc & was serviced 18 months ago. So that stunning hi beat movement which is a pleasure to watch that sweeping seconds hand glide at that pace along with the great sound a hi beat makes as it ticks at 36,000 bph .
 
Another great feature of this incredible 431 calibre is the instant date change that  snaps over immediately at midnight on these hi beat calibres no slow approaching midnight change, they are fantastic movements .
 
Nothing needs to be done apart from enjoying  this stunning vintage piece,
It has had a new sternkrauz armoured chrome tension acrylic crystal fitted & I have added a clasp extender if needed.