I do not have any but I enjoy viewing an old short double street howitzer almost as much as a pre war 1911, especially with exposed hammers...
I could post a pic but it would look like a blurry copy of what Chaffee already posted. I have three 1878, 12's. And one 1883 hammerless 12 in a fitted leather case. Colt made some nice BP dbls back then.