Finally my "moonwatch only" book gets to pay for its keep. I just got my hands upon what I thought was a regular 3592.50 (my favorite speedy), but upon inspection it was actually something of a transitional between the 3592.50 and the 3572.50 termed by the book authors as a "professional yellow" and was BOTH a 3592.50 and 3572.50 , produced between 1995-1997 Without going into too much detail, basically it's a 3592.50 with a 3572.50 case back. So, it's probably my new favorite speedy.
I was aware of the different caseback of the 3592.50 but in the end I preferred the one with the Apollo XI text. Nonetheless, a beautiful pieces, love these 3592.50!
Beautiful watch. Love the gold plated movement! I echo the above poster, I really need to buy the Moonwatch Only book! Just wish it wasn't so expensive!