This is the "dark aqua" color that is typical of the post-1908 move of Brookfield to the plant in Old Bridge, NJ. Prior to this point in time, the Brookfield colors were more typically much lighter in color. Note that the earliest ad found for Brookfield advertising drip points dates to 1909, so the unit on the left is probably from 1909 or later. The question of just how long this color continued is up for debate.