This is the beautiful Guy Warrior Milk Tanker from Corgi/Husky. This casting was issued from 1965-1968 (17A-1). 

Collectors Note: This is the only variation with the round tank,  which is based off of the 14A Guy Warrior Shell Tanker. The later versions of this truck had a squared off tank. This is the desirable variation! This is in nice condition for a 40+ year old truck, it has some edgewear. If you collect Guy Warriors,  or Husky/Corgi this is a great find for your collection!