From the mid 60's...considered a quality bike in its day.

,,,Frejus didn't make any horrible bikes under the Frujus name back in the 60's
AFAIK.
Teh good ones I've seen have bee TdF labeled. If it goes back to the 60's even the best ones often came with cottered cranks. (But very pretty cottered cranks.)
Here's one from the mid 60's and another from the 70's. By the 70's the Frejus quality was slipping noticeably, as they struggled to compete in the bike boom years.
Look at this page on Classic Rendezvous.