broknprism
Welcome to the forum.
When we speak of a brass frame we are talking about the area of the pistol which houses the working parts.
Most of the original Colt and Remington Cap & Ball revolvers used brass trigger guards and many used brass grip backstraps.
Historically, most of the revolver manufactures in the Confederacy used brass for the frame as well as the trigger guard and backstrap.
This was done to limit the need for iron parts because iron was badly needed for other wartime items.
It is said (although I don't know for certain) that the Southern States during the war collected all of the brass they could, even melting down church bells to get material for the war effort.
This artificially aged newly made Italian reproduction has the brass frame typical of the Confederate guns. It represents a Schnider, one of the few Confederate "Colt copy" pistols which incorporated a octagon barrel like the real Colts.
Most had a round barrel up to the heavy part that attaches to the frame.
As you may have read, the Brass framed reproductions are weaker than a steel framed gun. If you ever get one it is recommended that you shoot light to medium power loads in it.