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Sigma Ceramics produced a popular line of ceramic collectibles and housewares featuring Miss Piggy and the Muppet Show cast, beginning in 1978. Sigma also produced Muppet mugs, vases, bookends, mirrors, canisters, banks and ornaments. The line continued through the late 1970s and early 1980s. Sigma Muppet Collectibles are some of the most sought-after pieces in the world of Muppet merchandise not only because of their rarity, but there attention to detail in terms of accurately depicting a character's personality in a whimsical way. Each piece is individually hand-painted. Most pieces were not dated. The company Sigma is no longer in business.