I'm planning on attending an auction this weekend where there will be some Polaroid up for grabs. From the pics on the auctioneers website it appears there is some 55, 59, and 79. Probably just one box of each (at least it appears as such from the pictures posted). The question is, is it usable? If so, is it worth much? I'd hate to get all excited and bid up on it only to find it's completely worthless.