As mentioned above it's a 13-1 model and from the French made models, and are not sought after like some of the more famous Heuer models.
The Koni branding makes it more appealing to car people, but less so than probably other French models sporting logos like Champion (Spark plugs).
Given the condition you'll be looking at about the same pricing as a good-ish condition regular one if you find the right buyer IMHO.
It has some appeal to me as it's engraved 1980, is Heuer, and has Koni on it. I'd be interested to know what pricing you're thinking so ping me a message if you've got a value in mind.