On page 7 of those great Hamilton ads that Joe C. posted, did anyone else notice the Hamilton "navigation time/stop watch"? I've never heard of that one before this, is that a common watch?I wonder wether it was based on a 4992B.Must be a high grade and complicated movement.I know Hamilton made loads of watches for the military, but this is a new one on me....Ted.

Theodore, There were a few that showed the 4992B, and then this one which shows a 2974 which is truly a Navigation watch/chronometer.

My Bad, sorry, a model 23 is what I meant. Thats what I get for "multi-tasking"!!

Actually thats a Hamilton Model 23.

These are the differences from my collection