Soft Pad Markings  

nope
Just glanced at the one in the office. No stamped marks - just stickers.

Thanks, that's all mine have...
Thanks, that's all mine have too. Just got 8 management soft pads in amazing condition in black leather and 6 executives. They came from a bankruptcy sale of the infamous Marc Dreier's NYC law firm.
Some of the older aluminum group chairs that I have, have the HM logo stamped on the frame. These just have stickers with model numbers, signatures and "born on" dates. I feel better now.