In both the USA and it’s Canal Zone Posession, the printers experimented with a new Dry Printing technique. Many issues of the period exist in both their “Wet” and “Dry” printing types
The wet printings used a thicker, stiffer paper and in some cases display distinct color differences.
The following images show a few Canal Zone stamps in both printing varieties.
The “Dry” variety is listed first, and the “Wet” variety shown second. These are listed in Scott Specialized for the Canal Zone. The Dry printings occurred AFTER the Wet Printings.
Scott #105, 105a