Our Solar System! 4 Different USPS Forever Self-Adhesive Sheets 2016-2021
Scott # 5607c--Sun Science--Pane of 20 (10 different) issued in 2021. This sheet was made with reflective foil that changes color as the light angle changes. Scott #5076a---Views of Our Planets--Pane of 16 (8 different) issued in 2016.