Rare Red 4 inch F15 Edmund Scientific ota

This is a very rare collectable red 4 inch f15 telescope tube assembly from Edmund Scientific.  It has some minor cosmetic blems and a minor blem on the lens as seen in the pic.  It does not affect image quality.  It has an Edmunds style 1.25 inch focuser.  This is a very rare collectable scope from the 1970s.  Images are very good with no obvious aberrations other than some slight false color.  Asking $600.  Pickup strongly preffered in Chicagoland.