One of the really nice resources on this website is the collection of Heuer catalogs Jeff Stein has uploaded for us all to view. On the home page, go to and click "Catalogs" and look for the 1970-71 catalog. Your stopwatch (503.201) is shown on page "202" of that catalog. It's actually the fifth page. This is a stopwatch, not a chronograph. Catalog says "1/5 second recorder", 0-60 mintes. Someone else with more knowledge can comment on values. I'd guess $100 - $250 but I really don't know.

: i have recently acquired what i believe to be a watch from either
: the 60s or 70s but am having trouble identifying it. can anyone
: please help me. it is a single button chronograph and there is
: nothing saying the model number or make on the watch. i can not
: find any pictures of it on the internet to post to this site.
: the only info i might have are some numbers written on the box
: itself 14-647-10 and 503 201. can anyone please help me in
: identifying this heuer please