Trying to date what I believe to be a 1969 Colnago Super. The head tube lugs changed after 1970, but my bike has the 1970/71 slightly more fancy, ornate design. But the bottom bracket has the 1968/69 9 hole pattern, and the rest or the bike fits the 1968/69 standard. My thought is the bike was built right at the end of the 1969 season with a mix of 'old' 1969 lugs and new 1970 head tube lugs. Thoughts?