A postcard on the aerial view of the Wat Phra Si Rattana Satsadaram (Wat Phra Kaeo or วัดพระแก้ว) and the Grand Palace (พระบรมมหาราชวัง) in Bangkok. Thanks Jobbo.
A ฿15 stamp on flower was used together with a ฿3 stamp on the Queen and a ฿1.25 stamp showing the aerial view of the Grand Palace and temple similar to this postcard. They were cancelled at Pak Kret (ปากเกร็ด) on an unknown date. Maybe 20.7.