Thai banknotes have serial numbers at top left and bottom right corners. The top left serial number has a prefix consisting of single digit Thai number and a Thai letter of alphabet followed by a 7 digit number.
The bottom right serial number similarly has a prefix consisting of single digit Western numeral and a letter of the English alphabet followed by a 7 digit number using Western numerals.
Prefix system:
In any note, the Thai and Western numeral prefix (indicated by 1 and 4 in images) are always same.
9 Thai and 9 English letters (indicated by 2 and 5 above) are used to get various unique combinations for a batch of notes.
For a new series of banknotes (not signature change), prefixes always start from 0กA. Each combination gives a batch of 1million notes (0กA 0000000 - 0กA 9999999). See combinations below.
Serial numbering of Replacement Notes using prefixes "พ" and "S" will be discussed at a later date.
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