Very Old Catholic Book Golden Key Of Heaven. Velvet & MOP or Celluloid  (?)

Very unique velvet & fancy work on front.  I saw one that had been sold as Mother of Pearl, and one as celluloid and I am not sure which it is.  Copyright is 1892 and there is pencil writing in it of various people and dates, the earliest being 1903.  It has it's clasp and pages are gold gild. Some pages are loos and some pulling away from the spine. Book has pictures also.  Fragile condition and selling as is.  Size is 3 x 4 1/4 by 1 1/2.

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 Thank you for looking.