Omega Seamaster Mariner II

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Hi,
I receive on offert to trade my de ville tank, bought for 130€ but very beautiful (estimated value 300€) with a Seamaster Mariner II Quartz.
I don’t use the tank so much and I will not use the mariner too, i d like only to talk about the economic value of both.
I see the Seamaster like a way to buy another watch soon, with a value about 800/1200€.
What do u think about the trade?
Could I really try to sell it near this price?


I attached the two Watch on post.

many thanks for your advice.