A few more Photos....... I was uncertain if it was a pressure lamp or not but after I opened the tank it revealed all.
It's an interesting lamp and the link below shows relevant information. American Lighthouse Lamp Identification Document | US Lighthouse Society
Hi Astro, It appears to be a simple center draft wick style burner. It's missing the chimney and flame spreader and part of the wick raiser mechanism appears to be missing too. Dan
Interesting mob are Chance Bros and Co of Birmingham. Around in 1880. Very prominent in their field(s) in 1884. A very historic lamp.