The marks "LPC" and "No55" on an 18k gold and pearl brooch likely indicate the manufacturer's or designer's initials and a specific item number, respectively. "LPC" may refer to a particular jeweler or brand, while "No55" could identify that specific piece in their collection. Additionally, the "18k" mark confirms the gold's purity, indicating it contains 75% gold. These markings help in assessing the brooch's authenticity and identifying its provenance.
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