Washburn, the brand name of Chicago based Lyon & Healy, was just one of several US Companies manufacturing the zither for the domestic market. From the late 1800s to the early 1900s, it is estimated that somewhere between 2,000 - 3,000 Washburn zithers were manufactured.
The above image of a Washburn zither label reads "The Washburn / Best in The World / No. 1642 / Material and workmanship fully guaranteed for the term of one year from date of original purchase provided this label is not mutilated / Highest Award at World's Columbian Exposition Chicago - 1893 / Gold Medal and Diploma of Honor, Antwerp, 1894"
Are you aware of other US zither manufacturers? If so, please contact us.