New York, New York. Christoffel & Booths Patent Elliptic Boiler Tube Scraper. Bowers NY-4122. Gilt brass. 34 mm. Mint State.，Obverse: A boiler tube scraper on an open field. Reverse: Lavender heavy card printed with seven line advertisement, CHRISTOFFEL & BOOTHS / Patent Elliptic / BOILER / / Tube Scraper / WILL SAVE / 25 per cent. / of Fuel. Lustrous and bright with trivial losses of the gilding in places. The card is bright, clean and undamaged. According to Bowers, there are only two of these cards known, this one and that in the collections of the ANS. This is the Bowers plate.，Ex Presidential Coin and Antique, July 1993, lot 71; Steve Tanenbaum, 2011; Q. David Bowers Collection.，
