Hi Richie,
I think you have a early muppets style guide. They are used for ref. to create an accuate reproduction of the muppets. They are given to all of the companys that have a license from henson.
They change the style guides all the time. I would love to see some of the older stuff.
I am currently working with Master Replicas on the muppet posers that will be coming out later this year.
Hope this helps,
Propologist
Mike