In 2003 I ordered a DVD from Mike Dorffler.
It was full of scale information and pictures of the Mercury Little Joe. I had always wanted to build this as a scale model but was never able to get enough information.
On the forums there was some discussion between Peter Alway and James Duffy about a mysterious black fin. James Duffy is an
authority on Mercury Little Joe scale builds.
As it turns out, three fins are silver. The remaining fin is orange on one side, black on the other. This is the only picture I could find of the black fin. Some thought this was a shadow.
The right side of this fin is pretty dark, the same density black as the capsule. The other side of this fin is painted orange.
This picture seems to be the Little Joe LJ5A or LJ5B.