Sonia's Plectrum

Cannot be auctioned, traded, or bazaared, but can be delivered to a character on the same account.
Cannot be obtained as a random reward from the Gobbie Mystery Box Special Dial and similar sources.

A plectrum (or pick) is a small flat tool used to pluck or strum a stringed instrument. For guitars and similar instruments, the plectrum is a separate tool held in the player's hand. In harpsichords and other keyboard instruments, the plectra are attached to the harpsichord's jack mechanism. Sonia, the NPC, is the Field Musician Captain for Bastok and it is logical that this item refers to her and not a real historical figure.