Not a Speciale Corsa (or Super Corsa, if you prefer) and probabaly not a Cinelli of any kind. The flat fork crown means it's not an SC, although the Cinelli Model B had flat fork crowns. But what makes me say "not any kind of Cinelli" is the seat cluster. I have never seen that kind of set stay attachment on any Cinelli, in person or in a photo - the style looks more British to my eye than Italian. Also, the seat post bolt is not the kind Cinelli used. Finally, classic SC's used a 26.2mm seat post, not 26.4.

The front drop out attachment style looks wrong to me also, but I am less certain about that.

So I am all but certain it is not a Cinelli of any persuasion, and quite certain it is not an SC, but it does look like it could be pretty nice frame in its own right, assuming you can get the stuck seat post out without damaging the frame. (There are other threads here on how to do that.)

For educational purposes, you can get a lot of visual information about what classic Cinellis look like on Classic Rendezvous and on Cinelli Only. Sorry for the lack of links, but they come right up if you google them.