Creskol, it seems most likely that this is part of a very early candlestick, however it is difficult to judge the exact period. Obviously it is of great age, as you can tell not only by the design, but from the patina which is actually patina upon patina, where a deep patina was scuffed off and then repatinated. As you know by now, most brass candlesticks are flared and the simple straight tops are few and far between. You can find them though dating back to at least the 16th century (if not earlier) up through the early 1700's.
http://images.google.com/imgres?img...+candlestick&ndsp=21&hl=en&sa=N&start=42&um=1
Like I mentioned, the patina is so old that it must have been in the ground a very long time. The fact that candlesticks are objects which often were passed down in a family and no doubt often traveled here from europe, makes it possible that this one is of a period much earlier than the site where you found it.