1910 AMAZING Mechanical Postcards Mini View Books Boston LA CA Music * LOOK * For Sale

Set of three absolutely incredible and unique mechanical postcards from the early 1900s.
A Note From: includes an envelope with a snap that opens up to reveal asheet of music, divided back, unposted, in very good condition with corner wear edge wear only.
Greetings from Boston, Mass, Letter carrier services, copyright 1907, patent, postman carrying bag of mail that includes a removable tiny black and white postcards, accordion style, with views of Boston. Incredible. Undivided back, not posted, in very good condition only a bit of soiling. Amazing that the mini postcard view book is still intact.
NEA Convention, Los Angeles, CA, 1907 postcard promoting the convention comes with a small wood covered booklet tied to the card with green ribbon. Inside the booklet is a series of back and white photographs, accordion style, of various sites in California. Some soiling and wear and previous owners name lower right front corner. With all that said such a special piece! How has the book survived in that ribbon for over 100 years so we can now appreciate it. Divided back, not posted Assuming this is the National Education Association based on the quote.
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