I was thinking along the same lines...
Here in my garage i have a frame that is amazingly similar to yours.
It's a Concorde Astore which i bought here in belgium.
It's been stripped from part for repainting and i seem to have misplaced the pictures.
What i do have are some pictures from the seller of the bike.
The lugs and braze-ons are very similar to yours, including the internal cable routing and number hanger.
Does yours have campy dropouts?
If you want i can take some pictures of my frame and take some tube-measurements.

I think some of the old concordes where in fact built by Ciöcc and brought to The Benelux, painted and sold here as Concorde.

Sorry for my english, it's not my native language.

Now for some old pics: (if they are too big just let me know)