OlderNotWiser put to my attention a bike at veloseven dot com. It is said to have the serial BCOO34 but I am fairly certain it is BCOC34. I am also certain it is rapainted frame.
Picture borrowed from veloseven
New in
red.
F020
(added 15/12 2018)
F030
F041 (added 13/10 2017 owned by c c rider)
F058
F136 (added 7/7 2016 found at "vintage art work" on flickr)
F208 (added 13/10 2017 - owner - bloodytea.
F.243 (added 5/5 2016 - and also has a dot as 254)
F.254 (has a dot between F and number)
F268 (added 29/4 2020 - found on instagram) Gewiss colours
F277 (added 29/4 2020 - found at Premium Cycling)
F287 (added 16/8 2016 - found in old ebay auction)
F.301 (added 10/5 2021 - by owner OlderNotWiser)
F326 (added 17/1 2017 - found at registrostoricocicli.com)
F370
F382 (mine)
F403 the one in the PDF-file at
https://www.ciclimasini.com/images/90...i%20Caurus.pdf
BCOC34 (added 15/5 2021 - found at veloseven.com)
BCOC88 (added by Pattycakes in the thread)
BCOC104 (added 25/10 2016 courtesy of scooterpants) Stolen in 1993 - if you see it - let scooterpants know.
BCOC112 (added 25/10 2016 courtesy of scooterpants)
BCOC115 (added 25/10 2016 courtesy of scooterpants)
BCOC157
BCOC359 (last digit might also be a 3) (added 28/2 2017 - from
telaio Bianchi Columbus Max BDC-Forum.it)
BCOC360
BCOC515 (the O probably stamped at an angle - making it look like BCCC)