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19th Century antique binder from Germany made by Friedrich Soennecken who invented office supplies. Paper is bound into a book or portfolio, to be placed in a transportable leather binder. The binder contains lettered sheets to separate papers into categories. Gold pressed lettering in the leather tell us the binder was Kopierpresse #1 and was manufactured or sold in Berlin, Bonn and Liepzig Germany.
Friedrich Soennecken (9/20/1848-7/2/1919) was an entrepreneur and inventor who started an office supply business. Besides pens to write, he sold quality paper and binders, including two-hole punch and ring binders. This binder seem to be a “Soennedken File” introduced in 1886.
A label on the manuscript inside the binder states these letters are “private” (Prive”). There is some damage to the leather binder and to the binding of the book.