When I started
vaping, there weren't alot of VV mods available unless you were willing to buy a Provari. I bought a Rubicon, which was made by a friend of mine and sold alot back then but he no longer makes them. It was a basic black box
mod (an electrical type box) but it did have the PWM circuitry and still to this day works great. I will always keep it for nostalgic reasons even though it's ugly as hell. lol.
