I've had this in storage for decades. About a year ago I cleaned the keyboard, replaced the end connector, and tested it with Soarer's Converter and everything worked perfect. I have to slim down my belongings so this is for sale. 

All the keys work. The original connector was damaged so that was replaced. The only issue I know of is that the little circle cork feet on the bottom of the keyboard are gone. They are for sale by other sellers on ebay for a little more than $5 shipped though.