This flash unit is a classic Vivitar Auto Thyristor 255.
Vivitar Auto Thyristor 255 Electronic Flash Unit SEE NOTES works
Vivitar Auto Thyristor 255 Shoe Mount Flash vintage film camera flash unit
Vivitar Auto Thyristor 3900 . Complete And Fully Functional And Tested .
Vivitar auto thyristor 283 shoe mount flash gun tested working. Made in Japan
Vivitar Auto Thyristor 550FD Flash Gun for Minolta, Pentax Cameras Etc WORKING
VIVITAR AUTO THYRISTOR 225 HOT SHOE/PC SYNC UNIVERSAL POCKET FLASH GUN - TESTED
