I had a Marathon Navigator,but there might be some confusion as my Navigator wasnt a dive watch,it didnt have a screw down crown and next to no water resistance really.
Mine was the composite body version,the disappointment for me was a very sloppy action when setting the hands to the correct time,and had lots of play.
I couldnt get used to the vials mounted on the hands either,and didnt care for the shape of the hands.
The vials did glow brightly but mine was new.
Hope this has been of use.