Whew, that's good to know! The only thing I did know is the 300E didn't change TOO much from the mid-80's-early-90's. I was hoping this ornament was the right one. I thought when I first got it that it was broken.It is the right one, But it will be terrible to attach the 3 pieces together first, Ask me how i know.
Anyway, I am worst than you in explaining, so I hope someone else here would tell you how to do it.