Colnago '80s Model type?

[Jesper]

Is the chainstay bridge telling?


I'm not an experienced Colnago-man, but so many are, so - ..... asking for a friend? For model clarification? So many were moving away from a bridge at stays in early-mid 80's. DeRosa around 1985/86 on SLX/SPX. Maybe earlier?

My '86 N. Mexico has the bridge/cable guide integrated into the BB. That style came about at least by 1985, maybe on frames made in late '84 for the 1985 model year. There's always some guesswork since even if an original owner purchases a bike/frame in a given year (not custom ordered) it does not mean that frame is that year's model and/or manufactured in the same year. I also doubt if the contract builders were in lock-step with the Colnago factory in instituting new features before using up existing stock while it was feasible.
The style of the bridge changed from tube type to "spool"/"hourglass" shaped circa '81, definitely by '82 year frames. Not all models got the newer BB so some models (probably lower end variants) still used the spool bridge into the late '80s; not sure if used into the '90s or not.

Photos from late 60s to mid 90s(?).