Hello, I am looking for information about a very interesting and beautiful Heuer Leonidas SA Stopwatch I have, or at least to be pointed in the right direction as to finding more information about the watch. It seems to be a very rare Stopwatch. It's a Heuer Leonidas SA 17 Jewels with working case. It has stamped and hand engraved numbers. They are:
129090
ISA15GC
1295
5.76.69GC
15AGQ700
#S4 (can't really tell if it's S4)
3.7.71
1295X
Thats all the numbers I can find engraved on the inside of the watch casing. The watch has a 12 hour dial, a 60 minute dial and a 30 minute dial as well as the seconds and so on.

The box/case is wooden with a red fabric and a tan soft lining. It has metal loops on each side for attaching a strap to it. It also has a button on the top so that the watch can be operated from. It has "#9" written on the back of the case as it must have been the 9th watch in a set of watches. Every expert I have shown it to have all said that they feel this watch may have some importance. I live near the Indianapolis Speedway and one expert said it maybe a late 50's watch from the Indy races. Another said that it maybe from Purdue University for airplanes or even boats. Either way it has been well taken care of.
https://ibb.co/gXMR4o
https://ibb.co/mOpkx8
https://ibb.co/nhCDH8
https://ibb.co/hM614o
I don't understand how to get the images to work. I have it listed for sale on Ebay and there are a bunch of pictures that you can look at. So saying that as an advertisement for it. Just as a place where there are plenty of pics. Thank you in advance for your help with this!