While examining the color of some other pieces in a lightbox, I came across an upgrade to the corkscrew that I have had in my collection since the 1980s. I certainly did not go to Springfield expecting to purchase one of these given all there was to choose from. As a result, I am offering the one I have owned for over 20 years. There is a very small flake on the very top of the spiral and a small flake on the corkscrew. As I said, it took me 20 years to find one better. This is the [010] embossing on the base with the pointed dot present. Exact embossing on the base is +NAT.INSUL.CO.+ PAT. MAY 1.DEC 25. 1883. JAN.1. OCT.7. 1884. This one has the segmented threads. I am offering this for a very fair price of $90.00 plus shipping. First email.