Not sure about the vintage, this could be an old museum copy. Fully extended is about 42 inches. See all pictures for conditions.
"Sir, Your buckle is a reproduction of the buckle used in the filming of "Gone with the wind Worn by Ashley Wilks in the film. The item "CIVIL WAR CSA CONFEDERATE STATES OF AMERICA CIVIL WAR BELT & BUCKLE US ARMY USA" is in sale since Thursday, December 01, 2016. This item is in the category "Collectibles\Militaria\Civil War (1861-65)\Original Period Items\Belts & Belt Buckles". The seller is "italianwarfront" and is located in Orange, California.
This item can be shipped worldwide.