The worst 'charming flaw' I've seen on an older bike was the "cold" BB on a '73 Guerciotti. (It was stunning stunning everywhere else though.) http://classicrendezvous.com/Italy/Guerciotti/Guerciotti_J-Bissell.htm
I'm still working on a vintage De Rosa page...pour yourself some grappa and take a look: http://www.mookietwoh.com/derosa.html
Jack Bissell Tucson, Az
Anyone have more pictures of pre-SR Ugo bikes?