Abstract: A collectible coin can be enveloped between two sheets of thin clear flexible plastic. The two sheets, with the coin centered on and between them, can be heat sealed together around a perimeter to create a coin envelope. The coin envelope can be secured around the perimeter by a snap-together assembly including front and back parts of a holder. The coin envelope and/or the front and/or back parts of the holder can include one or more alignment features that fix the rotational alignment of the envelope along with the enveloped coin within the snap-together assembly. The front and back parts can also secure and display a certification label describing the coin. The front and back parts with the coin envelope and certification label can be securely enclosed in a tamper-evident protective clear plastic case. The sheets can be made of, for example, polyethylene terephthalate glycol or polyethylene terephthalate.