welcome to our little corner of the world (or at least our little corner of the internet).

according to Heuer's scheme for numbering these chronographs,

• 510.500 is the stainless steel case
• 510.501 is the black case
• 510.502 is the olive drab case
• 510.503 is the pewter / gray case

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

: I am new to this forum, though I have been
: corresponding with Chuck Maddox over the
: last couple of days via email. I have a
: Heuer chronograph that I purchased new back
: in the mid-80s; it is stamped "510
: 501" on the back. When I look at the
: 1985 catalog posted on this site, however, I
: see an anomaly. My watch has both day and
: date; according to the catalog, this should
: be a 510.502.

: I have never had the watch worked on until last
: week, and the back was not changed, as I
: have pictures of the watch I took just prior
: to sending it to the watch repairman.

: Can anyone shed light on this?

: Thanks,
: Walt