I know the scene you are speaking of. A wise man once taught me the secrets of deleted seinfeld scenes. He used to sell t-shirts outside the world trade center.
The episode this is from is the barber, and the scene occurred at the end. I beleive it is a very short head shot of Newman without any hair. The story behind it is this: Jerry shaves Newmans head in the barber shop as punishment for stealing a hair sample and ratting him out to Enzo.
I believe this is one of those scenes that happens just after the closing credits, and more than likely, we don't see it anymore because of increased commercials in syndication. Oh well. It should make it onto the dvd, so patience my son.
Stay outta the deep end