Restored as a member
I always thought Proxibid was world wide. Not sure I understand your comment that they do not allow anyone from USA to participate???
https://www.proxibid.com/Art-Antiques-Collectibles/Collectibles/Caterpillar-Magazines-amp-Sales-Catalogs/lotInformation/56774705#topoflot
You have asked a difficult task as in the past some sellers have "planted" bidders supposedly bidding for someone else to either drive up the price or they get left holding the bag so to speak.