B4-B9 varieties CSS 923a, 924a, 925a, 926a and 927a WITHOUT SURCHARGE, 928a is only found without surcharge taken from the Souvenir Sheet CSS 929a

B4-B9 varieties CSS 923a, 924a, 925a, 926a and 927a WITHOUT SURCHARGE, 928a is only found without surcharge taken from the Souvenir Sheet CSS 929a