Dieffenbach's® Old Fashion Potato Chips. A family tradition. In 1964 Mark Dieffenbach started making potato chips on his kitchen stove in berks county Pennsylvania. A short time later he built his own kettle cookers, which the third generation of the Dieffenbach family is still using today, to bring you the best potato chips from the finest hand selected ingredients. We are sure you will find our potato chips to be the best you've ever tasted. That's why we put our name on the bag. Elam Dieffenbach, Nevin Dieffenbach. Phone: 610.589.2385. Look for our other quality chips and pretzels or visit our web site at: www.dieffenbachs.com.