This is the finished tube portion only between the lens cell and focuser, completely baffled inside with the world's blackest paint as it came from the factory. It has NO dents, scratches or scrapes and looks virtually like new, except for several dull spots from teflon screw tips where the FS-78 was used as a guide scope, but these do not penetrate the white finish, and could perhaps be waxed or polished out.
The tube is about 15 1/2 inches long and 94mm outside diameter, the ID is about 91mm. The ends are threaded on the outside and appear to be the same metric thread. I do not know for certain if this could work as a replacement for the FC-76 tube, but it is the same OD, and uses the same tube clamp.
$80 shipped in CONUS, or trade for GP/Takahashi/Intes/Giro compatable dovetail clamp system, or other possibilities of interest.