Unmarked but is constructed in the same manner as another one I have, marked U S Standards Kerby Bros makers NY, I think that this is an early version. Circa late middle 1800?s Natural and brass fittings 19 inches long X 7/8 inches wide With a slider and marked for the sizes in measurement increments in inches, meters, Paris, and American shoe sizes. This is a very nice old tool as well as a nice item to add to you collection of vanity items. CONDITION: Very good, typical patina for it?s age. Two small old chips on one edge. Steel screws have surface rust. Would clean and polish nicely if that is what you like. SHIPPING: US- included. Will combine postage. I am glad to answer any questions. Please message me with any concerns. Visit my other stores for more vintage and antiques. https://www.etsy.com/shop/AbbysTreasures?ref=listing-shop2-all-items-count#items https://www.etsy.com/shop/BookandPaperShop?ref=listing-shop2-all-items-count#items https://www.etsy.com/shop/BlueJugAntiques?ref=listing-shop2-all-items-count#items https://www.bonanza.com/booths/AbbysTreasures https://www.bonanza.com/booths/tansycollection https://poshmark.com/closet/abbystreasureshttps://www.bonanza.com/booths/Abbysantiques