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
C Rouyer, New Orleans

Casimir Rouyer was an watch maker operating out of New Orleans.  The backmarks are usually blank or weakly struck. 

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

Rouyer02, (22mm)
B5362B.JPG (35023 bytes)
Backmark: "C. ROUYER / N. O. ", dm between two rings of dots, very weak stamping, Manufactured by C. Rouyer, New Orleans, (Rouyer02).
Tice page 184, item count #2 [C2-11].

B5362 B5362A.JPG (34105 bytes) B5362B.JPG (35023 bytes) Confederate staff officer, eagle facing right, southern manufactured "local" button (22.3mm)  Ref: Albert CS21A, Tice CS254A2