I've been very lucky to find 3 Heuer Autavia's and a vintage Monaco. One of my best finds was in a Reno pawnshop where I bought a mint original 2 register Autavia for $25 and a 1936 18k Rolex Cosmograph in mint condition for $3k. That was a good day.
When my dad passed a few years ago, I found an old Heuer chrono that was in a box of miscellaneous items. I know very little about it, or what it might be worth, but it's a very cool watch. I believe he may have bought it in the 40s when he was in Europe during the war. I have not been able to find much information. Would love to learn more about it, though. I had it worked on by someone who is knowledgeable about the older Heuers, he did a very nice job and it runs great. A little small by today's standards, I suppose, maybe 36 mm. Band is a Squinky repro -- I found the watch on an old Speidel band -- but here are some photos. Hard to tell because of the lighting but the hands are actually a bright metallic blue. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Did your watch repair guy take those pictures? The Movement looks incomplete (maybe during mid service). I'm not a Heuer guy but I would start looking at the 2444 per: OnTheDash - The definitive guide to Heuer Best, dsd
The dial on that watch is beautiful! It's a snap back watch - so you can pop the back off easily. Snap a pic, or two, of the complete movement, and it will be easier to get info. Especially if you can see the maker's hallmark beneath the balance wheel.
If you didn't know the Jo Siffert/Heuer connection here's a good read. Jo Siffert, the Heuer Autavia and the story of the world's first chronograph | Autoweek