The one without a model number plate or stamp (date code 1982) works. The other with the model number plate ( date code 1995) leaks air quite a bit but with a full tank in the compressor it did function in both directions ( note the trigger arm is flat / not spring loaded as it should be) . Both have some function left in them in both forward and reverse, but I am listing these as is / for parts or repair because I'm sure the new owner will want to go through them and rebuild them.