This Vernacular style four fold knob was made by Reading in the 1890 catalog. It is part of the H-25410 Windsor group. The set includes two knobs with a spindle and one double keyhole plate. The dimensions are Knob 2.25 in. diameter x 2 in. D, back plate 6.25 in. H x 1.75 in. W x 0.25 in. D, drop 1.75 in. to first keyhole, 3 in. to second keyhole, collar 0.625 in. diameter.