Hi Exaviator:
On further reflection, I think it is possible that the numbers you posted may be applicable to a Series 100 or Series 200 (or variant) aircraft - these being the very early production aircraft that were equipped with the PT6A-20 engines, and had a MTOW of 11,569 lbs.
The numbers I have given are applicable to the Series 300 and variant aircraft, which encompass SN 231 to 844 inclusive.
Michael