Vivitar 2800 Auto Thyristor Electronic Flash

Vivitar Auto Thyristor 255 Electronic Flash Unit SEE NOTES works

Vivitar 2800 Auto Thyristor Electronic Flash unboxed

Vivitar Zoom Thyristor 2500 Flash Gun – Vintage Camera Flash | UNTESTED

Sunpak Auto Zoom 2400 Thyristor Flash Unit - Untested

Vintage Vivitar 2800 Auto Thyristor Electronic Flash Accessory - Untested

Vivitar Auto Thyristor 255 Shoe Mount Flash vintage film camera flash unit

Vivitar 2800-D Auto Thyristor Flashgun Flash -