I always thought the CIÖCC connection was an assumption, what Concorde sellers use to upvaluse their bikes, since I read somewhere that the relation was never officially confirmed by Pelizzoli.
Most people advertise their Concordes based on an italian flag braze-on on the right side of the tubes as made by CIÖCC, while that is actially the sign for Billato, who also used to build for CIÖCC and pretty much for everybody else who matter and who didn't at the time. With yours its out of question based on the lugs and the missing flag braze-on. Really nice score! If you want to see other Concordes, check out "marktplaats.nl" without quotation marks for sure, and search for "Concorde" or "concorde fiets".
As said by the "local" fabiofarelli they have all levels of bikes including magic unicorns, what people see once and can never forget, but they never show up again.
If I had to make a wild guess, I would say Columbus SL (unlike the silver decal points to Cromor, and I think all other decals are the standard "Concorde" set from ebay for Aquila or Astore) with a non-original fork (not only paintjob is off, but they usually had the Concorde logo on the fork caps).

Heres a link, where someone sandblasted a similar one... maybe interesting for you for the fork.... note the decal difference as well....
Concorde - Ciöcc '80 ies project | DCI Steel Vintage Racing Bicycles (dcisite.be)

Best,

Lattz....