EARLY GLASS EXPERTS --> PLEASE LOOK

Never saw these before, have you? They are 9 3/4" tall, very heavy, flint (rings like a bell) ... somewhat similar to well-known candlesticks made by Bakewell Pears, also McKee, mid-19th century. But I have never seen the "knob" or "hobnail" pattern on the bottom in this genre of candlestick before, have you? The rounded "bumps" can be felt from the underside, top is smooth. The construction seems to be four quadrants; pic shows the horizontal seam. Wonder who made them, where they originated? I think they might be extremely rare because I've been an early glass collector for many years and have never seen these before! Purchased from a seller in central Ohio. Please comment! Thanks.