Gave an old Count Basie album a clean this morning and tossed it onto the turntable. The worst eccentricity I've ever seen--somewhere between 1/8" and 1/4".  The good news is that it amazingly doesn't sound that bad (although definitely audible toward the end of the side).  Explains why it's so pop-free--hard to imagine a 50s turntable tracking this.  Took a video, but I can't figure out how to post it.