Trade black 16613 towards blue 116613?

[Lt CHEG]

I got a black 1988 vintage 16613 when I turned 30 a little over 9 years ago. The blue was my first choice but the black came along for a good deal and I loved it so I got it. As I approach 40 in November, I am next on the list for a Seadweller 43 which should arrive before my birthday. I am also thinking about trading my watch towards a brand new blue 116613. The AD offered me the blue 116613 for $7500 plus my 16613, is that a decent trade? My watch needs a servicing and although it has a box I'm not sure it's the correct one and doesn't have the corresponding paperwork. Also the AD said that if I were to get this watch in addition to the Seadweller that I would be able to buy one of their ceramic 2 tone Daytonas next year. Should I do this deal, and is it a pretty decent deal? Thanks