Switzerland

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 SUL  TS  25  Free       1939-40               Stylized Tortoise               Large tortoise in front of a tractor pulling a trailer. Inscribed "1939, 1940" and "Col. de Tracteurs III/4". Gray, black, and red. Provided free franking for mail of Swiss soldiers. Authorized by Swiss postal authorities. Different military units had different stamps.
  SUL  TS  26  Free       1942      Stylized Tortoise               This is SUL TS #25 o/p'd "Releve 1942" in brown.
  SUL  TS  27  Free       1942      Stylized Tortoise               This is SUL TS #25 o/p'd "Releve 1942" in gold.
  SUL  TS  28  Free       1942      Stylized Tortoise               This is SUL TS #25 o/p'd "Releve 1942" in silver.