I have a field grade 20ga. 11486R that my grandfather bought new in 1915. My father gave it to me when i was six and it is always my first choise for Alabama quail or dove. It has a blued receiver and side plates. I ask both my father and grand father if it had ever been sent anywhere for repair and was told that was the way it was when my grandfather bought it. I have a 12ga. he bought in 1916 that is case colored with the R sufix. I always beleaved the 20ga. came blued by what my grandfather and father always told me. But i have never seen another or heard of one. I havent gotten a letter on either yet but don't know if that will tell anyway.