1966 Chrysler 300 certicard decode help

[Bryon Mason]

below is a picture of the certicard for my 1966 Chrysler 300 I purchased, I have most of it figured out, the II06 has me stumped. Can anyone help??

 

[413]

1106 means November 6th 1965 scheduled production date.

First line in VIN
second line has:
interior trim code
exterior paint code
Trans code
Rear axle code
SPD