Brass "Civil War" era American Eagle works well for
cap and ball revolvers of the 1860's. This historically
correct medallion is similar to the era's military
uniform buttons, and is made of brass (not plastic or
zinc). These are made in the USA by the same company which makes official military uniform hardware, and to the same quality.
These are modern production and are not
1860 vintage. Only the design is 1860's era, not the
actual medallion itself. (They would be quite the
bargain if they were this price and that old!)
These medallions are too thick for mounting in very thin
grips like the Rorhbaugh and Seecamp pistol grips, but work well in any revolver or conventional pistol such as the 1911 Colt. To mount the medallions, make a shallow flat bottom hole in the grip with a Forstner
bit or a flat end mill. Then use any good quality clear 2-part epoxy (5-Minute Epoxy) to secure the medallion in the hole.
These medallions are much higher quality than the zinc die-cast imports or metallized plastic that you sometimes see advertised. They are built for hard use,
and will not fade, crack or have the metal finish flake off with holster wear. They are build exactly the same way as US military buttons, having two disks with the pattern pressed into one, which is formed as a cup and then press fit to the second disk (which forms the back). The only difference between these medallions and the actual military uniform hardware is the back does not have a shank for sewing, being made with a flat back for easier mounting in a grip.
For World War I and World War II era firearms, see the 1940's Eagle medallion, made in the same manner.