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[[Obverse Text]] 咸豐元寶 [[Transliteration]] XIAN / FENG / YUAN / BAO [[Translation]] Currency of the Xian Feng mint [[Reverse Text]] 當百 [[Transliteration]] DANG / BAI [[Translation]] Value of One Hundred
Transcription Notes:
The left and right characters on the reverse are Manchu - anyone want to take a stab at it?