Friemann & Wolf purchased the plans and plant equipment from Passow (Pawa) and renamed it the Per
The Per was a considerable improvement on the Pawa, using a larger engine with enclosed engine bay, belt drive, and substantial additional weather protection. The engine supposedly ran on a variety of fuels, from crude oil to petroleum. Two models, with optional two- and three-speed gearbox, and chain drive to the rear wheel on later models.
It appears there may have been three models, using engines of 1.9ps, 3.5ps, and 8ps (344cc).
The machines failed to find a market in the dire economic climate of the times, and despite the support of the Berlin motorcycle manufacturer Ernst Eichler, advertising and detailed explanations in specialist publications, like hundreds of other motorcycle firms the company failed.
The August Horch Museum has displayed the only surviving example, restored by the owner, Michael Lehmann.