This cable runs from the power supply to the Write-In Unit Assembly in Rock-ola models that are 100 selections.
This includes models 424 Princess Royal, 429 Starlet, 431 Coronado, 434 Concerto, 435 Princess Deluxe, 436 Centura, 441 Deluxe, 443, 445, 449, 451, 453, 459, 461, 463, 467, 468, 469, 471, 473 and perhaps others.

Overall length is about 70 inches or 178 cm.
I have several and all are in good condition.