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On the Kessels fork crown, that is a set of dividers like a draftsman would use.
Builders he used, from an old interview with Merckx himself:
1965-Superia stock
1966- Peugeot stock
1967- Peugeot stock then rebranded Masi
1968- Masi
1969- Marcel ven der Este
1970- Guiseppe Pela
1971- Kessels and Colnago
1972-Kessels and Colnago
1973- Kessels and Colnago
1974-Kessels and De Rosa
1975-Kessels and De Rosa
1976-Kessels and De Rosa
1977-De Rosa
1978-Kessels and De Rosa
Some Kessels are almost identical to De Rosa, only the diamond chainstays differ.
someone asked me to upgrade his bike, but he doesn't know the make. Can you help me?
EDIT: and clean :)