Handle needs to be reattached to case. Not sure of year of manufacture, but research indicates 1890s-early 1900s. There is what appears to be a slight crack in the back of the zither. Looks like it may also be missing a couple of strings.
The item "Vintage Regent Zither No. 5 Late 1890s-1900 With Sheet Music & Case Flagg Mfg. Co" is in sale since Monday, April 6, 2020. This item is in the category "Musical Instruments & Gear\Vintage Musical Instruments\Vintage String\Folk & World\Autoharps & Zithers".
The seller is "trader-bug" and is located in South Ryegate, Vermont. This item can't be shipped, the buyer must pick up the item.