: Phil,
: thank you for your answer, in the pic you'll
: find the watch reference 510502.
: On the internet I find different dials, both
: with day and day date, and different
: positions of the Heuer logo. Don't forget
: that 1000 series is a
: "transitional" model beteween
: Heuer and Tag Heuer brands..

Good Morning, Andrea...

Thank you for the additional information, I have a lot to learn, yet! My LOST watch had 510501 on the back and a lot more written on it than noted on yours! When I got the first estimate for servicing from the old ProTime Inc. they had it referenced as a 510502 as it was all OD at that time! They could replace the OD finish and it was coming off all over, in little chips! So it became a TwoTone with all outside finish in Brushed SS and the Face still the OD, that was 1993! I hope UPS finds it, but not going to hold my breath!?! Enjoy yours anyway that pleases you as I did mine for the 23years I had it and it went all around the World with me!
Thanks for your help!

Phil