I have a Tag Heuer Professional 200 meter divers watch that I have had in my possession for about 15 years. I purchased at an estate sale and have not worn it in about 5 years. I normally wear one of my Accutron Spaceview watches but have decided to change it up and wear it for awhile. Anyway, on the back of the watch, the serial number is 980.020D. Can someone tell me what this serial number says about the watch?