There is also a companion Trijntje Vanderkloot’s 50th Anniversary Portrait. See also their “Matthijs and Trijntje Vanderkloot’s Golden Wedding Anniversary - November 15, 1901”. Matthijs Vanderkloot’s jacket appears to be the same as in the “Trijntje and Matthijs Vanderkloot Closeup - Summer 1897” but in this photo, he has all the buttons closed as if it is cold outside, thus matching a November time of the year.
Another possibility is that this could be Matthijs’ 70th birthday portrait, January 8, 1997. But I tend to believe this portrait is more likely for their 50th in 1901 as each would have had a separate portrait as they did for their 40th.
Anne Kaufman, a great-granddaughter of Cornelius and Gertrude Vanderkloot, provided a copy of this picture to Dave Jordan in 2005. If you would like to add information about this portrait, please contact Dave Jordan, a 2x great-grandson of Matthijs and Trijntje Vanderkloot. The Picture Reference Number is AK04.