||I think your data is still a coverage (or grid) or came from a coverage
or grid. If a prj file only has (or had) a spheroid defined, but no
datum, we convert it to a spheroid-based geographic coordinate system.
So, there's no datum information, we just populate the datum/geogcs
names with the spheroid name.
The closest one I can find it Lome for Togo which does use the same
spheroid. However, I don't know of any transformations for it.