This is a single cylindered Pope OHV from approx 1915. Rear suspension, plunger style, quite modern compared with ie Harly or Indian. Bet this was a fast little machine in its days of glory.
A Harley Twin Sport with need of air in its rear tire. This little Sport Twin with a fwd/aft boxer where made by the factory for export to European countries, ie Scandinavia where it sold in huge numbers compared to the US home market.