Onan 3dsp-1r generator I have an old Onan generator that came with our house. 3DSP-1R single cylider diesel generator. Not sure if it runs or not. What's it worth? Category: General Antiques and CollectiblesDate Period: Early 50'sWeight: 450lbsFor Sale?: No Know something about this item?Log In and Add New CommentIf you don't have InstAppraisal accountclick here to create one for free!