Seems kinda steep to me. From what I've seen, a 70's racer with 531 or Columbus frame and Campy NR equipment sells in the $500 - 600 range if it's clean. Paramounts bring more, but that's another story. Not that I'm disparaging Huret equipment, but I don't have the fondest memories of its longevity - just can't see paying that much.
Not bad when you look at what $600 will buy you new. It won't ride as smooth as the classic, and it sure won't be finished nearly as well.
One of my riding buddies around 1980 had a high end Motobecane. Orange in color, all Campy NR/SR, but I can't remember what it was called. Nice bike.
I set out to get another example of my old college days racing bike - Falcon San Remo 76, ended up buying two of them. Paid $500 for one that was pretty much mint, but the frame was a bit small for me. One showed up on ebay last month that was the correct size, but was rather neglected, been hanging in a garage for 20 years, so I snapped it up for $225, and it's currently under cleanup. Who would have thought those Campy gum brake hoods would be so expensive these days... especially with most other NR gear selling for next to nothing...