Identify Bianchi

[oskmat]

Does anybody know what year and model this Bianchi frame is. It looks like a Specialissima X4 but I can't find the "X4" marks.

Pics:

http://www.ladda-upp.se/bilder/jewqmtsftwtutl/
http://www.ladda-upp.se/bilder/fdvnyubzsfzydo/
http://www.ladda-upp.se/bilder/ziymbjygsbqgzw/
http://www.ladda-upp.se/bilder/lcgacnvwmozck/

Thanks!