1987 V12 serial number

I have a spare V12 with the 8S49669SA serial number. Using information posted on this forum it looks like it is a 1987 or 1988 vintage.
I noticed that there were other numbers stamped to the left of the serial numbers. What do they indicate? Time and date of manufacture? Application XJ or XJ-S?
Thank you

Thank You

I recommend that you post a picture of the engine showing the numbers you are asking about.