to you, Thomas of California.
Yes, indeed. This is a good site where watch collectors of different brands come to share information, pictures and knowledge.
I am not able to help you much here with my limited knowledge of Patek. Apart to knowing that ref 2499 is a one of the holy grail Vintage watch of Patek and its relative value to other Patek, I do not have very much more information. It's one of the high-end Patek Vintage that is very rare today. What an interesting to know that the ref 2499 is release in 4 series myself !
Perhaps you would want to frame your question with a bit more context. Why your interest on the Ref 2499 ? Are you looking to buy or sell this piece or do you hold on to one and checking the value ? I think with a little more background, you should be able to attract more specific replies that are helpful to your situation.
Regards,