The 2020 Summer Sale - Sale 333 Day 2

1962-65 a group of 4 C series First Day Covers,
including C91, C93, C98 & C111. Three locally registered to Tsinghwa University, One from Shanghai to Hong Kong, with arrival on reverse. Two covers with uprated stamps on reverse. VF-F.
1962-65年一組4枚紀系首日封，包括紀91、紀93、紀98及紀111等。當中3枚北京本地掛號寄清华大学，另外1枚自上海寄香港，背均有到达戳。其中2枚封背面加贴邮资。上品。