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Thai coins were not dated before 1874, and since have used three different dating systems.
Thai dates are read from left to right and use Thai numerals. Using the table below, locate a series of three to four numerals. Most B.E. coins will have the date system characters before the number (see Step 2).
Determine the date system (era) by finding which range the number from Step 1 is included (more or less).
|Characters||Date System||Number Range||Dates Used (AD)|
|จ.ศ.||Chula Sakarat (CS)||1236 - 1244||1874 - 1882|
|ร.ศ.||Rattanakosin Sok (RS)||106 - 129||1887 - 1910|
|พ.ศ.||Buddhist Era (BE)||2458 & Up||1915 - Present|
Take the number from Step 1, and add the corresponding offset for the date system found in Step 2. See the examples below.
|๑ ๒ ๓ ๖||CS1236||1236 + 638 = AD1874|
|๑ ๒ ๓||RS123||123 + 1781 = AD1904|
|พ.ศ. ๒ ๕ ๔ ๘||BE2548||2548 - 543 = AD2005|