COME ON!! If this really is the final season for the whole series, then they should at least let it have, like, a total of eleven episodes; taking place over the three years of 1925, 1926, and 1927.
Including the hour-and-a-half Christmas episodes
And then followed by a seventh season with eleven more episodes in the years of 1928, 1929 and 1930. Now that would conclude more interesting as a series finale!!
Series Six: Episodes 44-54 (11 Episodes)
Series Seven: Episodes 55-65 (11 Episodes)