The 888 is the interior color and seating style and the material they cover the seats with. So on an SS it would indicate bucket seats covered in vinyl or cloth with an indication of the color but I can not find that number.
The 9 I have no idea. Generally a number after the paint code indicates a vinyl top color or the fabric color of a convertible. But the highest number I have seen is a 5 for five different top colors (black, white, light blue, light green, and dark brown).
I have books that decode Protect-O-Plate codes (the warranty book), trim tag codes for both American and Canadian built cars and even some information on the build sheet codes but I have not seen a tag like that before.
I would look at the casting numbers, date codes, and identification numbers to verify where and when the motor, tranny, and the rear end where made. I suspect your car was made in Europe; possibly in Antwerp.