The Civil War Relicman, Harry Ridgeway
	Winchester, Virginia  Civil War buttons bought and sold
	relicman.com

Ridgeway Reference Archive, Civil War buttons
Catalog of button backmarks 
Jacob Gminder, Baltimore Maryland 

Jacob Gminder operated during the Civil War, and most of his buttons are definite post war.  However there are some backmarks that may be period.

Most information on this page is from Tice's book, Dating Buttons..., the pictures are generally from buttons that I have handled. 

Gminder01, (22mm)

Backmark:  "JACOB. GMINDER. / (dot) BALTIMORE (dot)" dm between outer rings of dots, inner ring of hyphens, probably made by Steele & Johnson, dating uncertain, (Gminder01).
Tice page 191, item count 1, [C4-9].

B4452     Virginia button, state seal Virtus slaying the tyrant, officer staff, Jacob Gminder Baltimore, dm between rings, (22.2mm)