Drum style. Based on design patent # D9709, Jan. 16, 1877 by Jahn W. Tiemann, William Simpson, Jr.,  and John Collins. The patent is for designs "consisting of parallel elevations and depressions, having one or more rows of dots on the elevations or in the depressions." Assigned to Hopkins & Dickinson. Shown in 1879 Hopkins & Dickinson catalog page 204.