Looks like a Pyramid to me. You cut off the handle if there is one and the hinge pins are in the dark ; they are two parts that make this mfg. stand out as well as the 3 fin draft caps. They had wooden handles so some are now missing....... Some had hinge pins stick up as much as they do down if I'm right. Some were badged Pyramid Heat Inc. and others Pyramid Intl. Inc. Here is the solid door; Here's the larger glass model;