The lady selling it is actually very nice- I emailed her to tell her about that high price. I asked her if it's a Centennial and even so they don't sell for much. I got one for far less than 300.00
She said she looked it up on an antique website. Then she asked me my opinion.
I told her probably more than she wanted to know LOL
But she was very sweet and said she wasn't trying to rip anyone off but didn't know much about them.
I guess b/c some of us all such old machine addicts we assume everyone else knows. :D