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These coins were round except for the scalloped 1 pula. Bronze, dodecagonal 2 thebe coins were introduced in 1981 and discontinued after 1985. In 1991, bronze-plated steel replaced bronze in the 5 thebe, nickel-plated steel replaced cupro-nickel in the 10, 25 and 50 thebe and the 1 pula changed to a smaller, nickel - brass , equilateral-curve ...