Recently a customer sent me a VHS tape for transfer which looked like this:

I didn’t even attempt to play it in my machines as I didn’t want to be cleaning the transport all day but I did find an interesting U.S. based company that specialises in restoration of very damaged video tape.

http://www.videointerchange.com/video_recovery.htm

I have no direct experience of this company but from their site they seem very knowledgeable and can transfer some very, very obscure formats from the past.