This is a rare vintage PERKIN-ELMER VERNISTAT VARIABLE RESISTOR, model #1240117-1, with a 2X4 configuration. It has been tested and comes with a manufacturer warranty of 3 months. Made in the United States, this resistor is a valuable addition to any collection of electronic components. It falls under the category of Potentiometers and Variable Resistors and can be found in the Passive Components section of the eBay store. This item is perfect for anyone interested in electrical equipment and supplies and is a great find for those in the business and industrial field.