20 Roubles Leo

Belarus has issued an extensive series of zodiac-themed silver coins since the early 2000s, but this Leo entry is notable for its construction rather than its subject. The filigree insert — a separately fabricated, gold-plated silver lacework figure loose within a sealed transparent capsule — is produced using a technique more common to jewelry manufacture than coin striking. The insert moves freely when the coin is tilted, which is either an engineering curiosity or a collector irritant, depending on tolerance for novelty issues.