The Simmons V-Tac had a left-hand windage knob, but that was back in the days before scopes had left-hand parallax adjustment. So it had an adjustable objective lens.
The V-Tac was in many ways ahead of it's time--and a victim of poor marketing guesses. It not only had very repeatable adjustments (with the tall, well-marked turrets that are so fashionable today), but good glass and a "ballistic" reticle. I used it to shoot quite a few long-range prairie dogs, and it worked fine.
But it appeared during a period when it was fashionable among some optics companies to list unrealistically high suggested retail prices. They did this to make retailers think they could make a killing, but all it really did was convince shooters that some products were way over-priced. The V-Tac has a manufacturer's suggested retail price of around $1000, but the wholesale price was so low it actually retailed for around $500. It was worth that much--but not many shooters believed ANY Simmons was worth $500. So it didn't sell worth a hoot.
Simmons and Weaver brands were owned by the same company, and eventually the company decided to "rebrand" the V-Tac as a Weaver, hoping it would sell. That didn't work either, so it was dropped entirely.
