1930s a group of 3 Siamese 15stg stationery covers from Nong Bua Lai, Ubol and Va Ringra, Northeast Siam to Jaoping, tied by Nong Bua Lai,
1930s a group of 3 Siamese 15stg stationery covers from Nong Bua Lai, Ubol and Va Ringra, Northeast Siam to Jaoping, tied by Nong Bua Lai, Ubol and Va Ringra cds respectively, along with Bangkok rice-selling promotional d.s. Example from South Siam are rather scarce.1930年代一組三件暹羅15士打郵資封,由暹羅東北之Nong Bua Lai、Ubol及Va Ringra寄饒平,銷Nong Bua Lai、Ubol及Va Ringra日戳,旁鈐曼谷大米宣傳機戳。