What does 120 14k msco mean on a necklace?

The inscription "120 14k msco" on a necklace indicates several things: "14k" signifies that the piece is made of 14 karat gold, which contains 58.3% gold content. The "120" likely refers to the weight of the gold in the piece, expressed in milligrams or a similar measurement. "msco" could refer to the manufacturer or designer's initials or a specific mark associated with the jewelry's brand.