[chronotimers]

You can see the most popular DW-5600 back from the 80's , 1987 to be exact if i'm not mistaken from the thread below

Which version of the DW5600 is this?

Smithsonian listed as donated by Nasa to the museum. I know it is a DW5600, but which version and is it still available? And if not, what is the closest modern equivalent?

www.watchuseek.com