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Your coin is a charm
The first picture should be rotated 90° counter clockwise
The second rotated 90° clockwise
The reverse shows two stylized dragons shasing for a pearl
Quote Primaltrek:
Dragons are often depicted as chasing a round object that resembles a "pearl". The pearl is frequently shown as a "flaming" pearl which is on fire. This pearl represents a fiery ball made of qi (气) which is the dynamic creative force of the universe. Dragons, which can animate nature, will fight to gain control of this generative energy.
The pearl may be thought of as a metaphor for perfection and enlightenment, particularly if the dragon represents the emperor.
The pearl also resembles the moon. As a dragon devours the pearl, less and less of the pearl is seen and the pearl appears as a waning moon. As a dragon disgorges the pearl, more and more of the pearl is seen and the pearl therefore appears as a waxing moon. The dragon and pearl thus symbolize the endless cycle of transformation.
Frequently, the "pearl" is shown with flames which symbolizes magical powers and may represent the wish-granting pearl of Buddhism.
The pearl can also refer to riches, pure intentions and genius in obscurity.
The pearl (flaming pearl) is one of the Eight Treasures.
Charms with the pearl symbol may be seen at Eight Treasures, Open Work Charms, and Auspicious Inscriptions.