Welcomed to the Team Niilo!
That I do not know. The STL indicates to me that it was made in St Louis, MO USA and imported some time in the past.
But that could be just as easily have been made in Saint-Lô, France for all I know; if it was made in Europe. I do know that they made full size cars in Brussels, Belgium in the sixties.
Usually the option codes are a number ranging from the number 1-5. Inside of a group number there were letter codes from A-Z that indicated a specific option. I do not know what or why certain options were picked to be encoded, because we also know that not every option bolted to the car was listed on the trim tag.
If you are luckily you might find a copy of the build sheet stuffed somewhere in the car. Every option generated a build sheet, and was installed by an assembly line worker who was supposed to throw that sheet in the trash when finished installing the part. But some workers where lazy and hid them in the car rather than walk to the trash bin.
Those numbers look like the Fisher Body company sequence number (it listed sequentially the order in which the body was built for use on the assembly line kind of like an internal company VIN that no one ever wrote down).