Some additional info...Weinnmann Type 500 brakes (circa 1979 off date stamp), Sachs Huret Derailleaur, cogs and chainset also Sachs, as is handlebar mounted shifter. Wheels are Mavic MA2 rims with Maillard 700 Hubs. Bottom Bracket is by Baylis Willey.
Also, the rear seat-stays have a nicely crafted concave bit at the end where it meets the seatpost. Here's a better pic of what I mean...