[jnanian]

No it doesn't have extra masks.

when the camera is open and you are looking at the film gate
there are 2 rectangles that crop the image and convert it to 1/2 frame
you just slide them UP / they lift out of the camera ... kind of like little clips.
it took me forever to figure that out ... careful though, easy to lose and you will never
find replacements... i believe you use the FIRST window for 6x6 after you remove the masks.

have fun
john