Thank you all for the swift responses. I did some more searching, and yeah, these don't appear to all that rare.
This came from an old estate, I'm pretty confident it's authentic.
I'll let me friend know. Maybe I'll make him an offer.
I also got a another
really nice goody from him.
I'll post some photos in a few days when it arrives.
I'll have some questions for Mr. Burney..
