[Sean]

I think that is one that you would have to completely strip the chassis of all parts and go through a rust removal process of some sort followed by painting the chassis.  It is complete and doesn't look like it has been hacked on.  The crystal may be a little tough to find but you don't need it to get it operating.  A 465kc crystal might be a little easier to find than the 1600kc one for my SX-10.  In fact there is a Bliley crystal on ebay that should be exactly what was used in your set.  Mine has a Bliley in the same case.