I know that most everyone here, including myself generally thinks that they aren't very good flutes except for a couple of their upper models which are kind of okay...

My question is - I saw a couple of hem offered on Ebay - one 40th anniversary model and one 50th anniversary. How are these different? Are they standard models with some fancy commemorative logo or are they the top-end handmade models?

I looked online and found virtually no information on them, so I got curious.