Internet Auctions like Ebay
I have collected these postcards for several years. I had never heard of them until my wife showed them to me on Ebay. There are about 250 diferent images and they have been printed in a variety of locations at a variety of times.
Lots of people think the artist was Mainzer, but that is actually the publisher. The artist was Eugene Hartung and there is very little information available about him. If you want to see the cards, visit my Mainzer cat website.
I will be inserting Mainzer Cat Postcards I plan to sell here with links to the detail pages.