Not sure Jim. That catalogue is the first evidence we have of it, but it's pretty difficult to tell what Heuer were producing during WWII; given they were based in a neutral nation production did continue, but of what and how much of it left Switzerland is another story. From what limited number of serials I've seen, I think 500xxx is pretty much immediately post-war, so I'd hazard a guess that your watch is after 1945 and probably before 1950 but that's without any great deal of confidence.

And the brochure just repeats the instructions for using the tachy and telemeter scales in German, French, Italian and English. The English is a lot more concise than the German though and omits a fair bit of the information - marketing was a nascent art back then and it looks like they just got someone with a little English to translate the general gist of it! Interesting that the German specifies "enemy gunfire" and the English just says "flash of a gun" when talking about using the telemeter scale.