I am the original owner of a Heuer for which I only know the serial number from the backside of the watch: 986,015N. Does anyone know anything about it, please? Thank you!
Well, it's a Heuer model 1000, in the "young sportsmen" format as Heuer used to call it. Here is a picture of it from the 1985 Heuer catalogue: You can find the full catalogue on the front page of the Calibre11 site under the "knowledge centre" section.