One of the great Madonna and Child

[John Preston]

colleagues,
I must say that 's not my thing , I missed it , as much regret , but nothing could be done already .
My knowledge is not that deep to immediately identify the author, but it is clear that this masterpiece was made the great master.
I vaguely remember that I saw a similar picture , with perhaps some differences in the composition.
Work on wood , 48 by 36.5 cm
What are opinions on the authorship of this work ?
I still think in the studio Cranach ...