Well, I just ran a bunch of searches for "Mowrey Gun Works"...I guess they must be out of business. I was unaware that they ever made a pistol, but I see no reason that they shouldn't. You're going to have to go to your local Library and start looking in past issues of gun publications; annuals, magazines, etc. to pick up the traces.
I have only seen one actual, I-can-put-my-hands-on-it Mowrey...that's a rifle owned by a member of my club. Two-piece stock (some of the fanciest wood I've ever seen), octagon barrel about 30" long, brass "receiver" in which the lockworks are, with a side hammer, and a brass Swiss-style buttplate. Impressive-looking piece.