Thailand. (Air Mail). 1924. Registered envelope addressed to Berne, Switzerland bearing Siam SG 214, 5s carmine (2) and SG 221, 25s indigo (2) tied by small 'aeroplane' date stamp of Uttara with hand-struck framed 'R/Uttara' in red, endorsed 'By Air Post', routed via Bangkok with Bern arrival.