: Welcome to forum John, and nice watch.

Hi John,
As Mark pointed out.. we did a bit of research into these.. the info is here:
http://www.chronocentric.com/forums/heuer/index.cgi?page=1;md=read;id=41100

Further reading can be had here:
http://www.chronomaddox.com/valjoux_7750_engine.html
http://onthedash.com/Guide/_Catalogs/1982_Specialty_Catalog/?show=1982P08.jpg
http://www.eta.ch/swisslab/7750/7750.html

Stewart

: By most points of reference, Heuer made very little of anything
: when it came to the chronographs. They were something of a high
: profile but low volume addendum to a business that was largely
: concerned with making the stopwatches and timers.

: But this watch was indeed likely to have been one of the watches
: they didn't make very many of even in comparison to some of the
: others. In fact, it was something of a moot point what to even
: call it until Stewart inadvertently gave me some info I needed
: to solve the riddle of its reference:
:
: With regards to the 750.501-3...
: Like I say, it isn't in any OTD catalogues, but it is listed in the
: OTD MOAT.
: When I first saw pictures of them, I presumed they were Black PVD
: Pasadenas that had the PVD sanded/polished off. (This is still
: the case, you see many '750.501' marked Heuers that are
: stainless steel - these have had the PVD removed, probably
: because they looked tatty). But, I've seen sufficient
: 750.501-3's for sale that are in good/mint condition, that are,
: or appear to be factory stainless steel. Coupled with the info
: in the OTD MOAT, it's solid evidence.

: With this paragraph Stewart, you've solved the riddle whether
: you know it or not!

: It was Heuer's model code schema putting them into a bit of a
: fix. The terminal numeral of the numeric code usually denotes
: material, in these six digit codes as well as the four digit
: ones, with some exceptions like the divers. 3 is most common,
: and denotes steel, 5 is gold plate, 8 is solid gold and 1
: denotes a PVD finish.

: In calling the PVD 750.501 a Pasadena and the steel 750.503 a
: Montreal, a problem arose when they wanted to produce a steel
: Pasadena. Logically, that model would be a 750.503, but that
: number was already taken by the Montreal. Looks like the
: compromise was to append a -3 to denote a steel case to the
: existing 750.501 code for the Pasadena and differentiate it from
: the existing Montreal. Hence 750.501-3.

: Makes complete sense to me now.

: In fact, that thread makes a good place to start reading up on the
: watch and its siblings:
: http://www.chronocentric.com/forums/heuer/index.cgi?page=1;md=read;id=41052