Martelly-Coppi vs Fiorelli-Coppi.
Every now and then you see a bike with a very special fork crown.
A 'Coppi' bike... These bikes were made in Belgium by Martens (Martelly) and in Italy by Fiorelli.
We try to find out if and how you can detect the difference between the two.
The seatstay and the lugs seem to be the places where we can possibly spot differences.

The forkcrown can't tell us the difference between Martelly or Fiorelli

Headtubelugs are not consistent enough to see a difference between Belgian or Italian

Fiorelli bracketlugs seem consistent, Martelly has a different bracketlug

Overal conclusion: the seatstay and the bracketlug may be the biggest hint wether it's a Fiorelli or a Martelly. Needs further investigation ...