File:Casio PT-87 with ROM Pack RO-551 World Songs.jpg - Wikimedia Commons
Casio CTK 551 100 Song Bank Keyboard, Purchased For Family Member Was Over $300. Don't Believe It Was Ever Used, Comes With Power Cord, 61 Keys, Good Condition, 37 1/2"W x 14
CASIO CTK-551 USER MANUAL Pdf Download | ManualsLib
CASIO CTK-551 - YouTube
Casio keyboard model CTK-551, Hobbies & Toys, Music & Media, Musical Instruments on Carousell