How to Trade OP39 for OP41

[HuskyGrad101]

Hello,

I was fortunate enough to purchase the blue dial OP39 last year before they were discontinued. It seems I did it at the right time, because secondary markets have used ones pricing at around 6500-7000. I would like to try and trade this in for the blue dial OP41 (+ or - money). I never loved the green indices, and with more lume/a little bigger for my bigger wrist, this seems like a good thing for me to pursue.

For anyone who has done something like this in the past, how did you do it? Should I contact the AD I bought the OP39 from? I looked into just selling my OP39 but a place like Bob's only offered me 5,000 for it.