Vintage De Rosa versus Kessels bicycle.
Period 1977 - 1978, Fiat en C&A

 Vintage Kessels Merckx from 1977
Thanks to Dave.B United States
 

Merckx Kessels bike 1976 Campagnolo Super Record 

Thanks to Dominique.B

Kessels Merckx Bicycle, A story by C.P.
New York City

Vintage Kessels Merckx first generation racebike 1971 - 1973
How to identify a high-end frame?
How to identify a Kessels 3nd generation frame?

 Vintage Kessels Merckx from 1977
High-end, third generation
Made for a client for the shop of W.Benoye

Vintage Kessels Merckx Molteni bike from 1973.
Presumably mid-range: eye-lets, no hollow seatstay, no two holes in the BB?
How to identify a Kessels Eddy Merckx frame

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.

Vintage Kessels Merckx bike, first generation 1971 - 1973