Upload & Sell: Off
...I didn't know about the auto sensor of the Vivitar 285HV, for $80 I'll need to consider that.
Yeah, they're not as well known as they once were; they used to be THE workhorse flash of many wedding and photojournalism pros. I've been using them for almost 40 years, and even though I now have three dedicated EOS Speedlites I've hung on to two of my Vivitars.
Here's a shot of my oldest one, and a close-up of the auto-flash sensor (the aperture at the bottom of the "Vari-Power Module." There are four color-coded automatic settings for different apertures, and manual settings for full, 1/2, 1/4, and 1/16 power. (Oddly, the manual progression skips 1/8 power.)