The ungrooved receiver, frontsight and it's base and inscriptions tell the story: It is a custom restocked early production DSM 34 "military" trainer barreled action. In one of the photos you can barely make out the inscription in front of the bolt handle: "Deutsches Sportmodell", in part covered by the stock. According to serial number it was made in 1935, see Jon Speed's book "Mauser Smallbores". BTW "459" is the gauge number for .22 barrels, applied for unknown reasons to all .22 barrels by Mauser up to 1945. The rifle was custom restocked probably in the 1960s, see the ugly "white line" spacers then fashionable.
As it is it is a nice .22 rifle, but no collector's item, as it is not factory original, but a conversion of a pretty common model. Here in Germany original DSM 34 sell for about Euro 400.-. A collector may value the barreled action only if he has got an original K 98k type stock.