If anyone out there is interested in Amphicat information, the seller of these items says that he was friends with the president of Amphicat and he would answer any questions that anyone might have about the machines. Here is the link for the ebay auction for the NOS Amphicat stuff that he has for sale.
eBay Motors: Original Amphicat stickers and Plastic cup. No Reserve (item 140177740116 end time Nov-16-07 15:48:01 PST)
eBay Motors: Original Amphicat stickers and Plastic cup. No Reserve (item 140177740116 end time Nov-16-07 15:48:01 PST)