OMY GOODNESS I am having such trouble because of the DOBs. Different documents have different ages for him all within 1 yr of each other. The 1885 Census record has him at 42 years of age on JAN 1st, that sounds right since his birthday making him 43 would have been Jan 6th.
So perhaps he is indeed the Nils Mattsson with DOB 6 jan 1842 :o)
sorry for so many posts, I have not delved into my tree for months and when I got your email I had to relook at so many things.
Thanks so much ANNA
are you of swedish ancestry?