I lied.... they are serial numbers 00074 and 00075. I think that we had 00019 and 00020 somewhere out there but I can't find them. These were Rain Bird's first entry into the fully electronic controller market. These controllers were built, by hand in Irwindale California, not far from their current CA headquarters in Azusa. All of their controllers were built there in that facility until the early 90's when they moved the controls group to San Diego and the controls manufacturing facility to Mexico. That crappy brown first version of the ESP was one of the first controllers that they built in Mexico. The CIC, CRC, RCM and ISC all shared a common architecture and were very very well engineered and built controllers for their time. Somewhere I have a prototype ISC that was taken out of the field. I'll have to look around for that one too.