If all else fails you can read the trigger voltage of your flash. Some 283 (ones made in korea before a certain date) had a very high trigger voltage and I mean high. All the ones made in japan and later ones made in korea had 6 volts. To test the trigger voltage take a volt meter short the flash with the probes and read the max voltage. It should spike at no more than six volts.
I'm not saying this is fool proof and not even saying you can make it work but it always did for me. I had one high voltage 283 but it was being used on an old mechanical camera so I didn't worry much. I did put a red mark on it so I would know not to hook it to a modern camera.
Im pretty sure that it was because the korean model lacked a relay that triggered the capacitor. Instead it triggered it directly which gave the full hit back to the camera. It was before the modern slr digi or film, so nobody thought anything of it.