David Sprague also had these notched chip, some examples of real chips made for customers, and some just Chipco demonstrations.

• First one is apparently a Chipco salesman's chip from my part of the country. Don't believe I'd heard his name before.
  
• DFS Galleria is a shopping center in Las Vegas. This was apparently a "gift chip".
  
• The final Chipco sample is unusual in that it shows a jet plane, and has a denomination that is apparently in Balboas for Panama (BS).