Fifty Fifty C

Or is it?
This was the first 'Fifty Fifty' although it didn't have a number as it was just a one-off. And then another 'sort-of' one a few weeks later before taking a 'proper' second one at the end of January, since when I've done one every day.
So is this really C or still only 'really' XCIX and the 'real' C is tomorrow?