Clamp-on shifters and the overall look of the frame say "mid 70s" to me. I'm guessing yours is a '75 with drivetrain upgrades done in the '80s. The 600 rear derailleur is post-arabesque but pre-SIS, so maybe 83-85? The crankset is late '80s. Biopace HP rings (grey sticker, less oval) came out in I think '88 or '89, and biopace died the death in like '91.
If I had to guess, I'd say the original parts were French, and were replaced with Shimano as they wore out or broke.
--Shannon