User blog comment:Sirfrenchfry/worth of item (NOT ON WIKI)/@comment-35195609-20180615192353

You can find the Rare Wristwatch on the Adventure RIMs page, although it can be tricky to find. Using ctrl + f on your keyboard and typing in the name will help you find it faster.

According to the page I linked, the Rare Wristwatch is only worth 1 RIM.