Id'd? 1/9th Plate Tintype of Armed Federal Soldier with Plum in Kepi

Identified? 1/9th Plate Tintype of Armed Federal Sergeant – Henry Clark, 1862
 
Offered here is a compelling 1/9th plate tintype depicting a Union Army sergeant, armed with a Colt revolver and sporting a distinctive plume adornment in his kepi. The soldier is confidently posed, wearing regulation Federal uniform, his sidearm prominently displayed – a classic and evocative image from the American Civil War.
 
What sets this image apart is the identification that also creates a mystery: affixed to the reverse is a handwritten note identifying the subject as Henry Clark of Rochester and Springfield, Illinois, dated 1862. The note also includes additional information regarding his family lineage, signed in 1952 by Nellie Smith Collier of Olympia, Washington – likely a descendant or family historian.
 
The tintype is housed in a leatherette case that remains in good condition overall. While the case is missing the bumper on the lid, it otherwise presents well and provides suitable protection and display for the image.
This example, rich in historical character and documentation, offers both visual impact and genealogical significance.