Updated Blog: August 1, 2026. My newly acquired stamp during the past month. A chang surcharge ona salung King Rama 5 Portrait stamp. the stamp was surcharged around 1896 to be used as a Court revenue stamp. Chang was a very high value in 1896. 1 chang = 20 tamlung = 80 baht. It is said that 1 chang could buy a shophouse. Chang overprints are rare and have a black surcharge. Shown however, is the only known mint chang with a purple color surcharge. There is a second stamp kn