Interesting item!! I do not know the source or history of this stamp apparently advertising Stamp Life Magazine.  No Gum (sheets were stuck together and had to be soaked) Cinderella.  See scan.  From a large collection of 19th Century and early 20th century I will be listing in coming months. Scans show mixed condition.  This collection has been sitting untouched for many decades.  The scans show them as they are, I identify them as best I can, I make no guaranteed claims as to identification or genuineness. Page not included, for display only.