Don't see anything like that on the current VAM list for this date and mint, so this might be a new one (for which you would get credit as discovering) - previously undocumented 1890-CC VAM's have been found over the last few years, so it's not impossible.
Leroy Van Allen is the only one who attributes VAM's. http://www.vamworld.com/Guidelines+for+Die+Varieties Chris Correction: New VAM's