Antique B&M 4 way switch railroad lantern Peter Gray & sons Pattern Dec 1811 For Sale

I am not a railroad person or lantern either I just like antiques an unique items this caught my eye so I bought it .it has 2 tags one says B& M

RR the other says Peter Gray & sons Inc Pattened Dec.11 , 1811 that is all I know about it ,no dents or rust I could see please look at my responses I am a honest person I only tell u what I see an knowbuying as is no refunds or returns will be well packed on one an above the blue lights there is a little round window ? about an inch in diamerter no idea what that is thanks for looking