Found this yesterday cleaning some boneyard shelves. It’s rare. It’s not for sale at this time.
Internally, the Black Cover edition shares much in common with the 1980 catalog. But it’s not a 100% duplicate inside. Acaeum discussion has more detail. Zenopus has a list of variations between the catalogs.
No indication of date, other than an “AVAILABLE IN 1980” statement. So 1979 publication?
It’s very cool, possibly my favorite of the TSR Gateway to Adventure catalogs. The white-on-black art of the cover really grabs the attention.
My copy is stamped on the back:
GRAHAM’S BOOK & STATIONERY
460 SECOND STREET
LAKE OSWEGO, OR 97034
The 1980 “Demon Door” catalog is 8 pages in length. It is much more rare than the 1981 edition.