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Achtung! Cthulhu 2d20: Black Sun Exarch Collector's Edition

The description for the Collector’s Edition states:
" A strictly limited Collector’s Edition of Achtung! Cthulhu"
What is meant by “strictly limited”?

Also, does the Collector’s Edition have a unique layout or are both the Gamemaster’s Guide and Player’s Guide essentially placed back-to-back within a single book cover?

Another question about the Collector’s Edition; does the debossed gold foil extend to the back cover?