Hi folks- an elderly friend of mine has what he thinks is a 1948 Co-op E3 tractor that he wants me to try and help him sell. I thought I might try and find out the exact year by the serial number but since I am a John Deere guy and have been for almost 30 years and I must confess I don't know much about Co-op tractors or where to look up serial number info, etc. I think I found the serial number on a casting boss on the top of the tranmission housing in front of the seat. The numbers are 6870 followed by a space and then A1719. Does anyone have any info to give me based on those numbers? Thanks! Dennis