1920-1930s a group of 5 Yunnan domestic covers f.w. Junk, SYS and their ovpt. Limited For Use in Szechuan / Yunnan issues. Including two
1920-1930s a group of 5 Yunnan domestic covers f.w. Junk, SYS and their ovpt. Limited For Use in Szechuan / Yunnan issues. Including two covers taking Indochina route.1920至1930年代一組五件雲南寄國內封，貼帆船、孫像及其加蓋限四川或限滇省貼用票。當中兩件為繞道印支郵例。
