Would anyone have any info on the code sequence stamped on the door lock cylinder on 57 f100's? Is it 1 letter followed by 3 numbers; 2 letters followed by 3 numbers, etc. or completely random?
The reason I ask is because I put a gash in it with the screwdriver when fighting with the clip during removal. I suspect there may have been a character there (letter or number).
Thanks for any insight.

 

Ignition/door lock cylinder code begins with FA

 

Thanks Bill. This code has, (after the screwdriver gash) the letter "L" followed by 3 numbers. Might it be a car cylinder as opposed to a truck? Maybe Lincoln?

 

Should be FA for all FoMoCo vehicles ignition/door cylinders thru 1979. Trunk/glove box cylinder will begin with FB

 

Got it. Thanks for the clarification.

 

In the interest of sharing information I'd thought I'd pass along what the local locksmith determined today. The door lock I pulled out of the 57 f100 with a key code stamped on it beginning with the letters FL and followed by 3 numbers was listed in the Ford section of his reference book. He spitballed the obscured "F". He then cut a key for it and it worked. I don't know if it's original or an aftermarket Ford type, but cosmetically it seems to be the right model of lock.

The ignition switch however takes a different key. So if they don't match I guess someone at sometime must have changed something.