This flash unit is a classic Cobra Auto Thyristor.
COBRA AUTO THYRISTOR SUPER FLASH - Tested - For use with Olympus OM10 OM20 etc
Vivitar 2800 Auto Thyristor Electronic Flash Boxed Camera Accessory Working
Vivitar 2800 Auto Thyristor Electronic Flash Boxed Camera Accessory Untested
Vivitar 283 Auto Thyristor Electronic Flash w/Manual - Faulty
COBRA Auto 150 Electronic Flash with Manual
