Hei! The Halvor Knudsen I`m looking for was born on the farm Nes in Hallingdal, but he moved to Flattum, Ringerike around 1820. He died there july 18. 1875.
I think the Halvor you are looking for was born May 21. 1835. I don`t know if it is the same person but his parents were also Knud Knudsen and Barbro Pedersdatter. Don`t know if he went to America or not.