The tulip motif is definitely a Somec mark:
http://www.somec.com/
But I think I've seen it on some other bike, as well (possibly Japanese?). In any case, I'd say that Colnago is definitely a Somec. And I agree with Charles that the Somec is more interesting than the more common Colnago.
Kerrigan Bennett Pleasant Hill, CA USA
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Norris, that font of everything cycling (meant as a compliment, Norris, I am in awe of every post you write, seriously) wrote:
"However..one more won't hurt.
Anthony Kinder is correct in thinking that this Colnago is not the real deal. I am certain it is one of the following - SANNINO, or SANCINETTO, or SIMONETTO...or possibly SOMEC...if only I could remember!"
*******
Isn't that cutout the mark of SOMEC? That's my bet.
Charles Andrews SoCal
(what's amusing about that is that a somec of that period is actually a more entertaining frame, imho, than a colnago would be)