Hayesno1
Senior Member
72HDX, Gravel truck is a 1963 as sn indicates 3092492. First digit "3" indicates year when manufactured 1963 next 2 digits indicates month of year "9" = September. Last 4 digits are consecutive production number - its a HDX 33-80 model. "33" indicates it got a 330 Hp engine and "80" is Gross weight is 80.000. I have not been able to find SN at frame or cab of HDX above parked in snow.