Twelve bowls for a wedding

A friend asked for twelve bowls as a wedding present for her sister: same size, same glaze, ready by the end of October. I have never made twelve of anything the same, so this was really a lesson in repetition.
I weighed every ball of clay to the same 650 grams and set up a simple gauge on the wheel, a stick on a clamp that just touches the rim at the right height and width. Every bowl was thrown to the gauge and trimmed to a cardboard template of the profile.
How close is close enough
Eleven of the twelve match to within a few millimetres. The twelfth is slightly wider and I have quietly made a thirteenth to replace it. They are glazed in the blue from the test tiles last summer, which looks lovely pooling at the bottom of a bowl, and they leave for their new kitchen next week.
The wider one is mine now. That seems fair.