1938, used stampm, This 10 C. + 10 C. denomination Pro Patria Swiss stamp shown above (Zu. WII #1y, Mi. #326y, Sc. #B90) was issued on June 15, 1938 for National Day.
A smaller quantity, only 160,000 of these stamps, were also printed on granite paper with "grilled gum". They are scarce and much higher priced. This variety is shown at the top of column two (Zu. WII #1z, Mi. #326z, Sc. #B90a).
