Spooky! The Twilight Zone music (in my head) adds to the atmosphere!
I am surprised no-one has added any more comments about these pictures, cachalote, especially the two US exclusives.
Collector 3rd edition has some tantalising entries, where there is a set number but no image...3123 and 3214 (p. 313), 3269 (p.317), 3131 and 3132 (p.320), 3281 (p.324).
Then there is the color set 3670 which appeared in the PM catalogue for 1980-81 but was never issued (p.76)
Three well-known examples of ghost sets are the 1989 roller-coaster (only released in Japan), the Mississippi Steam Boat (never issued) and the red framework house shown in 1980 promotional literature, but not actually produced until it was issued as a DS item in 2005.
I often wonder where Collector takes its authority from- its not a Geobra publication, so how certain can we be that sets included were actually issued - especially if no-one has ever seen them!