Silverado
From 2 pics it would be hard to tell if it was worth $9,$90 or $900.
The Silverado was introduced in April 1982.This one is closer to 1984 as it has the PN5.It probably has what became one of the best and most powerful Elux motors first seen on the Super J.However the very last Silverados were closed out as Diamond Jubilee was introduced and had the new DJ motor which was troublesome at first.From the brief description above it does not state new or used.The box looks good and it does have the attachment tray as it would be packed at factory.Many of these were given as monthly prizes to top Elux sales people and I have known of some of these that remain new.Just one of many possibilities here.