At first glance, some objects makes no sense at all.
Sure, this is a whale oil lamp. However, its font and stem have nothing at all to do with its foot.
The font and stem are typical—if extraordinarily rare examples—of hand blown lamps of the first quarter of the nineteenth century. However, the base dates to 1850 or even 1870. It is pressed from so-called 'clambroth' colored glass.