The only other one I've ever seen since I started collecting the Gerber cover covers in 2003/2004 was on eBay with a detached cover and amateur resto as I recall and it still went for something like $200. It's like the Rocket 3 where I've only seen one other and it was in worse shape (a Rocket 3 on eBay in Poor sold for more than I could pay at the time).
I always like an excuse to show this book off. Picked it up a long time ago and feel very fortunate to have it.
Ken
If that's unrestored and you'd like to, you know, unload the heavy burden that book must be on your collection, feel free to let me know.