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Suggest that you review the price chart on Speedmaster101.com. There is currently a sale of this model pending on Chrono24 for $11,214 USD.
I feel you’ve paid around twice what the watch is worth and it almost certainly won’t have a market value to match for a lot of years.
If you’re happy with the watch and price and can afford it then that’s all that matters. If you have even half an eye on value, you’ve significantly overpaid.