I can't speak to which you should keep and which can go, but what I found useful when trying to pare down the collection:
1) take the unworn watch out of your watch box and put it away somewhere safe but out of sight. If after 1/3/6/12 months you haven't gone to get it or missed wearing it, maybe its time to sell it.
2) list it for sale. when someone makes an acceptable offer, the first feeling in your gut is often accurate in terms of if you truly wanted to sell it or would regret doing so.
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