Terryn Charles frameset

Vintage Kessels Merckx frame,  third generation 1977 - 1979, how to identify a high-end frame?
It is always a subject of discussion. The thread running through every story is: Kessels did not make frames but imported them from framebuilders. Vaneenooghe in Ruiselede and Gaston Orlans in Gistel, both in West Flanders Belgium were two of the builders. 
On the photos below you can see only high-end Kessels-Merckx framesets  similar to the ones Eddy Merckx used in different races between 1971 and 1977.

Terryn Charles speaking  ...

Vintage steel race bike Charles Terryn

Charles Terryn, for a time mechanic for Merckx, had a shop in Anderlecht near Brussels. A lot of information you can find on the site of Le Cycleur. Most frames were made by other builders such as Roger Derycke (presumably the red one) , Weymans (presumably the grey one), ...