Wow first eggs after 1 year old! I wonder if Anconas are just prone to be bad to non-layers? I have read in a couple places on the net about Anconas just not laying many eggs at all.
One of my Faverolles laid first at about 18 weeks - 3 eggs (11/3, 11/9, 11/12) then nothing for over 2 weeks. Since then I usually get one but they rarely both lay the same day.
The two Ancona started on 11/21 and 11/22 and have been pretty reliable since. Only 6 days since that I didn't get an egg from either of them, They both lay on a given day with some frequency.
Bruce