I DON'T KNOW IF THIS IS CONSIDERED A ZERO, OR A DOUBLE OO. EITHER WAY IT IS TINY...MARKED ON THE THUMBWHEEL " H.B.&HAYDENS"...WITH A PATENT DATE OF 1860. THE THREADS ARE 7/8 IN, AND THE BASE OF THE CHIMNEY IS 1 3/8 IN. THE BURNER LOOKS LIKE IT WAS RARELY USED, BUT HAS SOME VERDIS GRIS ON THE SIDE OF THE GALLERY. T IS SOME WRITING ON THE VERY BOTTOM OF THE BURNER...ALL I CAN MAKE OUT IS A DATE 1860? THE CHIMNEY IS 5 3/8 IN TALL, AND HAS SOME ROUGHNESS ON THE FITTER END, ALL MINOR. THE CHIMNEY IS DIRTY, AND NEEDS CLEANED. NO RETURNS BASED ON BUYERS OPINION OF "SICK GLASS"Winning bidder pays $6 shipping , plus insurance in the lower 48, This is a set fee. it does not matter w you live in the continental US, this will be the shipping fee. This price does not include insurance. I use fedex, and Priority mail. Happy to combine shipping most of the time,and to ship most items internationally. All of my auctions are guaranteed as described.. Please ask any and all questions you might have, and thanks for bidding. The free listing tool. List your items fast and easy and manage your active items.