Hi, Just bought a house with this freestanding fireplace, which I'm guessing is from the 1950's since that's when the house was built. I don't see any identifying marks on it. The front grate lets most air through, so I believe you wouldn't call this a wood stove. The box is about 1/8" thick steel all around, with some bricks on the bottom (no grate) and some sort of concrete or stone back wall.
It doesn't heat the house very well, even burning what I think is well-seasoned hardwood. From reading other posts here I guess it's because it's essentially an open hearth fireplace, which isn't efficient at all. Question is whether there's anything to be done to improve it, like getting a glass front, adding additional bricks to the sides, closing the pipe damper part way, etc.