The banknotes of the two denominations are identical in characteristics and size to 50-Baht and 500-Baht banknotes, 13th Series, in circulation. The differences lie in the watermark of the portrait of H.R.H. the Princess Mother and the electrotype watermark of the number 90 in Thai numerals which is specially translucent. Under the watermark is the legend printed in blue for the 50-Baht commermorative banknotes and purple for the 500-Baht banknotes, Somdej Phra Srinagarindra Boromarajajonani 90 years old.
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