Can someone of the Rolex-expert please help a friend of mine whit this
questions ? :

1. Which year model Submariner first began using the current Rolex 31 jewel movement?

2. What was the first model year for the solid end link bracelet?

3. What about the "Gold through the buckle" clasp?

4. Which model year first came out with the current modern "Luminova" markers for improved nightime viewing?

5. When did the date dial switch to the "closed" numerals "6" and "9"?

6. I've heard that some of the earlier Submariner models from the early 90s actually had a more beautiful blue dial face than that found on current models. Is this true?