I see the loss of some of those records with the changes of ownership in the 80s as both a shame and opportunity. It gives us something to investigate, research and discuss whereas over in Biel-Bienne you can get a breakdown of exactly what the watch should be if you supply all the required numbers. Where's the fun in that?! The grey areas and unknowns in Heuer's history are part of the interest for me.
24 years retired and 30 years of service puts you right in the middle of what many of us see as Heuer's "Golden Period" Jean Paul - do you gave any favourite models or memories from the 60s and 70s? My own favourite model is a matter of public record here and elsewhere but no need to give that same answer!