Serial number help, please.

I recently bought a trencher, from the ID plate: Davis Manufacturing, Division of JI Case, a Tenneco company. Spec No. S69KR03, Serial No 1100691 I cannot find much online, what year, the more common model name (i.e. 30+4, etc.). Any info would be greatly appreciated. I cannot locate any engine info, SN, MFR, etc. Single cylinder, gas, starter/generator combo. It has been painted several different colors over the years.