5-6 inches. This lot comprises a trio of vintage industrial pressure gauges primarily constructed of brass for use in fire suppression and water systems. The collection includes two specialized sprinkler system gauges and one general pressure gauge. The first gauge is manufactured by The Ashcroft Mfg. Co. of New York for the Automatic Sprinkler Corp. of America, Cleveland, Ohio. It features a brass casing with a white dial scaled from 0 to 250, including the text Water Sprinkler and Non Freezing. The dial face displays an FM diamond logo and a date stamp appearing to read 1920. The second gauge is marked for the Automatic Sprinkler Corp. of America, New York, N.Y., and features a matching scale of 0 to 250. The third gauge is a smaller unit manufactured by The Ashcroft Mfg. Co. of New York with a dial scale of 0 to 30. This gauge retains an applied paper label from Instrument Lab. dated 10-20-65. All three instruments feature threaded connection points at the base for mounting to a pressurized system.