There is no official SOP for Birchen Marans. There is official descriptions for the birchen color in other breeds though.thanks for the comments, I wasn't aware there was an SOP for Birchen Marans,
here is picture of a roo (the one in the background) that is marked exactly as this one,,,,and yes I have seen the pics of many Birchen that show no baring
http://www.featherauction.com/detail.asp?id=1792&n=Black-Birchen-Marans-Rooster--8-months-old
I'm new at the chicken genetics but think there must be some strange things pop up when this boy came from a Blue Birchen /BCM
Like I said he will get time to develop and finish these early moults before I make any decisions
Walt