I need some help from someone who knows old pistols.

I was doing a little photo restoration on a picture of my Great Grandfather (mom’s side) and noticed something odd about a pistol he’s wearing. It appears to have two triggers. Not to mention the bullets on the belt look rather odd as well. More like big nails, than bullets. He was the Sheriff of La Plata County Colorado in the early twenties. That’s about the time of the photo. Here’s the picture (pre-restoration) and a couple of close-ups of the pistol. It sure looks like two triggers to me. That, or a rather odd trigger guard. I have shotguns with two triggers. Old Sharps rifles with two triggers. But I’ve never seen what appears to be a pistol with two triggers. Any idea on what type of pistol this could be? Or is?

Thanks -

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1980 300D - Veggie Burner !