colorful franking
two or more stamps of different colors, usually from a definitive stamp series, on a legitimate letter
en-GB/kɒləɹfʊl ˈfɹæŋkɪŋ/
en-US/ˈkʌlɚfəl ˈfɹæŋkɪŋ/
two or more stamps of different colors, usually from a definitive stamp series, on a legitimate letter