cover 1913 printed "The Royal State Railways Southern Line" XU5 registered from Bangkok (1.9) to London bearing mixed issue franking (6) and showing London arrival d.s. on reverse, the XU5 returned to Bangkok due to "Insufficent Address" (bilingual h.s.) with Siamese printed "OFFICIALLY SEALED" label and paper label applied over stamps and original address reading "To be returned to: The Royal State Railways, Southern Line, Bangkok". Unusual. Photo