Yet a serial number found. This time in an old ebay auction. Italian seller. Pics by "Ciclicorsa".
No F287. Possible respray. Decal on head tube, plastic wire guide under the BB, brake wire entering and exiting on top.
Updated list.
F030
F058
F136 (added 7/7 2016 found at "vintage art work" on flickr)
F.243 (added 5/5 2016 - and also have a dot as 254)
F.254 (has a dot between F and number)
F287 (added 16/8 2016 -found in old ebay auction)
F370
F382 (mine)
F403 the one in the PDF-file at
http://www.ciclimasini.com/images/90...i%20Caurus.pdf
BCOC157
BCOC360
BCOC515 (the O probably stamped at an angle - making it look like BCCC)