Tintype Civil War Soldier (?) Original Union Case Fireman Miner 1860s Photo Rare virginia but since it's behind glass

but since it's behind glass I can't tell positively what it is or whether it can be brushed or cleaned off

25" tintype is in excellent antique condition overall

There are maybe a couple of tiny mold spiders visible under magnification

In period handwriting on the back is written: "My darling little Mary"

intact case with no repairs

Tintype Civil War Soldier (?) Original Union Case Fireman Miner 1860s Photo Rare virginia but since it's behind glass1 9 tintype behind mat and glass in period thermoplastic case. Both the tintype and case are in very good antique condition. Shipping: Choice of well packed mailer or boxed Priority Mail. 8367A