It is possible for this hen to be a single comb Columbian Wyandotte but I'm sticking closer to a Columbian Rock. Here are some links that can help:
http://www.feathersite.com/Poultry/CGP/Rocks/BRKRocks.html
http://www.feathersite.com/Poultry/CGP/Wyand/BRKWyand.html
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