RCA 3-RD-30 Find?

[Army]

Hi All

My sister bought this old girl at an auction. I have no idea what she paid for it ? She wanted me to find out what it's worth. She said it works fine. I on the other hand am to chicken to plug it in

I haven't had much time or luck finding out much about it. Any help would be much apreciated. She's thinking she might sell it. Times have been tough for her family since she lost her job. And she'd like to know it's value.

Thanks in advance...
Army