Description:
 
Obverse
Lettering: สมเด็จพระนางเจ้าสิริกิติ์ พระบรมราชินีนาถ
Reverse
Lettering: 
มหามงคลเฉลิมพระชนมพรรษา ๘๐ พรรษา๑๒ สิงหาคม ๒๕๕๕
๒๐ บาทประเทศไทย
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