It is Steven With a V.
Here is a picture of lead sheet with the four various hallmarks I used over the years. Early on I realized if I didn't mark them in an obvious way, no one would know who made the gun.
Very early on I marked my projects with a simple SDH with letters cut down into the barrel. This you might find on any gun I built for Green River Forge.
After moving to my own workshop, about 1980 I continued to use the inset stamp but some in a silver plate inlet into the barrel. In the early 80's I started using the largest stamp with stylized SDH shown here, mainly inset in silver but also some in 24kt gold. It was mainly used on octagon Fowler barrels and all of a series of American Fowlers I built in the 80's and 1990's. The next die was the 1/4 x 1/2" SDH in raised block letters inset in 24kt gold. This is shown in the percussion rifles bbelow. The smallest SDH block letters in gold is 1/8"x 1/4" was used on all breechloading guns and in rifles since moving back to Montana in 1995. I still use this stamp today.
I built just a couple of Hawken type rifles, I remember one fullstock with silver mounts. In muzzleloading guns I built quite a number of 20 ga. Fowlers and I built a series of 11 California percussion rifles, two shown here.
I've never been prolific but have spent a 35 year career building the best guns and rifles I was capable of creating. All of my guns were built to hunt with and shoot and function was always important to me.
Largly retired, lately I've been compiling notes about my career as we have little time for this when simply living out lives. I'd be glad to try and answer any questions anyone might have.
Steven Dodd Hughes
American Fowler from 1990