Neat find. This was sold as the ‘Clover’ harmonophone (note the clover trademark) with a metal megaphone resonator, like this:
View attachment 2225933
This harmonica was made by C. A. Seydel Söhne, undetermined place, after 1900. It is a Clover model, with 10 single holes. This harmonica has a wooden…
americanhistory.si.edu
It was made by C. A. Seydel Söhne (‘Söhne’ means ‘son’ in German) and the company still exists today in Klingenthal, Germany):
Welcome to the oldest harmonica factory in the world. Feel free to browse through the SEYDEL web!
www.seydel1847.de
The U.S. Patents references are:
#642642, dated February 6, 1900, by Ferdinand Strauss, for a harmonica with a resonating chamber.
#423642, dated March 18, 1890, by John F. Stratton, for a new and improved mouth harmonica.
#483160, dated September 27, 1892, by Ottomar Meinel, for improvements to mouth harmonicas.
#605083, dated June 7, 1898, by Charles L. Curtis, for an improved harmonica.
Here's the February 6, 1900 patent for the attachment:
View attachment 2225937
To all whom it may concern: Be it known that I, FERDINAND STRAUSS, a citizen of the United States, and a resident of East Orange, Essex county, New Jersey, have invented new and useful Improvements in harmonicas, of which the following is a specification.
This invention relates to a mouth-harmonica, provided with a resonating-chamber, through which the air is ejected from the cell block to increase the volume and timbre of the tone. The resonating-chamber is of peculiar construction and is removably attached to the body of the harmonica proper, so that it is optional with the player to use the latter with or without the former.