Evidently, that's the old "wings" Martano logo. ps - it polished up REAL nicely.

Here's the photo I found (can't remember from where) of the Polish team rider with his old school Ciöcc. The image name calls it out as being a 76. But notice the slightly different downtube logo ("special" and the strange "O"). The seat tube decals call out "Curno" which is where his shop is located.