The Sharp's carbine was a relatively short weapon - less than four feet long - but that's still a lot longer than the Marx Miniature, which is only about 7 inches. Though it was widely used by cavalrymen during and after the Civil War, it was not the gun issued to Custer's 7th.
Marx later issued this gun with a silver finish. This one's a little blurry because it's still on the card under a blister pack.
Our Cap Gun Arsenal is HERE.