This is a nice old 1890's B&H Bradley and Hubbard # 3 Duplex oil lamp Burner 1 3/4 threads . Will hold a 2 5/8 fitter chimney . The wicks raise and lower easily , the wick snuffers work good .The gap between the gallery and burner is for were the shade holder sits . no damage to the burner that I can see . I do combine items to be shipped . I will have a couple hundred very good oil lamps and parts to be Listed on auction in the next couple of months .... As you probably noticed that the united states postal service has raised their shipping prices again Especially on large packages .It is still more cost effective to send a large package USPS rather than ups or fed-ex by a couple dollars . None of them handle packages any better than the other . I do ship all my packages USPS .