That's very cool. I didn't know the was a day, date version of the CC MK2!
I've seen references to the CC MK2 with an Schild 1858 / AS 1902/03. I cannot find an 1858 ref in the ranfft database, but I can find refs for both the AS 1902 and AS 1903 that seem to match.
Is this another case of a Rado caliber (1858) that is a modified Schild movement (AS 1902/AS 1903)?