Caseback, crown and pushers are ok. Maybe the markers, they look quite second execution Carrera. Don't think anything else came from Heuer. You'll notice how the caseback doesn't quite cover the aperture for it...

Some of the early watches did in fact have Heuer shields on. What they never had were Heuer shields that were hacked about and look like they were made in someone's shed using a hammer and chisel. You'll note "early watch" there too - which wouldn't describe any watch using a Valjoux 7733, placing it somewhere between 1969 and 1978. Valjoux produced lots of this family of movements with the lowest quality of finish and unbranded bridges (aka the cheapest for someone to buy), and they not infrequently end up masquerading as a more renowned manufacturer later down the line.

In terms of time, the Ed. Heuer & Co SA marked watches will only run up to the first few months of 1964, being replaced by Heuer-Leonidas branding after that. Though it appears that during the period of turmoil, ownership changes and the quartz crisis in the late 70s and early 80s, Heuer may have genuinely used unbranded movements in some of the watches.

A couple of points to watch out for, that also apply to the Autavia dial in the post below. Some manufacturers, typically at the cheaper end, do like to crow about the number of jewels and the shock absorbtion mechanism on the dial of the watch (the 17 Rubis and Incabloc in this case), this is not something Heuer were doing at the time. Nor did they ever put "Chronograph" above the shield where the name would be in a "series" watch (Carrera, Monaco etc). Or use that clunky, cheap-looking case.

What we call a "put together" and not a particularly good one at that - worth a fraction of the asking price for the salvageable parts.