General Motors VIN Decoder
A General Motors 17 digit VIN Number can be broken down into three groups of numbers:
Digits 1, 2 and 3 of a VIN number represent the World Manufacturer Identifier (WMI).
Digits 4 to 9 represent the Vehicle Descriptor Section or VDS.
Digits 10 to 17 represent the Vehicle Identifier Section  VIS.
A recently decoded General Motors VIN Number by this webiste is listed below:

Pontiac, 1981, WMI: 1G2, Checkdigit: Valid [7]
