1969 Blazer VIN

I am having trouble finding anyone who can help me decode the VIN on my 1969 Chevrolet Blazer. I am the 2nd owner of this Blazer and the original owner orderd this vehicle from the dealer in 1968. Everyone i talked to says this is not a valid VIN or the VIN is a truck VIN, but no real answers. This is the VIN that is on my title and on the driver side door pillar: BKE149S873719 if anyone has any idea on how to decode this VIN please let me know, any help would be greatly appreciated. Below is what i think is correct so far.
B - ?
K - 4 Wheel Drive
E - V8
1 - ?
4 - ?
9 - 1969
S - St Louis
8 - ?
7 - ?
3 - ?
7 - ?
1 - ?
9 - ?

This helps a little, but still incomplete.
http://67-72chevytrucks.com/Chevyear.html
BTW, with a member name like 'Big Texas', you better be from here.

BKE149S873719
 
Manufacturer: B= ?, 1= Chevrolet most letters mean other countries
Chassis Desination: K= 4 Wheel Drive
Engine Desination: E= V8
GVW Range: 1= 3,900 to 5,800 1/2 ton
Model Type: 4= Pickup,  8= Blazer, 6= Suburban
Model Year: 9= 1969
Assembly Plant: S= St. Louis
Vehicle Number: 873719, 19th unit built
 
http://www.lmctruck.com/icatalog/cb/full.aspx?Page=10