The Vehicle Identification Number (V.I.N.) plate on all 1955-57 models is located on the left front door hinge pillar post. This number represents the vehicle’s unique serial number for use with government agencies and vehicle model identification. Below is a guide for decoding a 1955-57 V.I.N.

Information courtesy of Classic Industries.

https://paddockparts.com/wp-content/uploads/2012/03/1957_Chevy_VIN_Decoding.pdf