English translation: conformity with original stamp; true copy stamp
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To get a stamped copy of your college diploma or/and TESOL certificates, take your documents to the nearest Korean Consulate. They will make a copy of your document and put a stamp on it that says it's an official copy of the original.
Explanation: "True copy" is standard wording on documents I deal with as a sworn translator. Cf. also:
Provincial Archives of Newfoundland & Labrador Inquiry Request Forms REQUEST FOR
TRUE COPY A TRUE COPY is a typed copy of the complete information extracted ...
(2) Certified True Copy of Certificate of Origin Misplaced, Lost ...
Import ... Certified True Copy of Certificate of Origin
Misplaced, Lost or Destroyed. Case ... www.tdb.gov.sg/ieinfo/tradenet/cs210.