vintage confetti colored marbled plastic Regaline fish plates, paper plate holders

Set of four vintage Regaline fish shaped holders for picnic / buffet plates... I think these are plastic, not melamine? They're 8 1/2" in diameter inside the top rim, and 6 1/2" across the bottoms. All four are in very good clean condition, I don't believe these were ever used.

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Item No. z723139