That appears to be some one’s hand (close) or someone’s bare @$$ (further away).
KEK
Is that Old Glory?
Im sure others will be able to see more and also get better information with higher magnification.
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You have indeed magnified the picture larger than I could. However, my eyes still tell me it is an entry way door of some type. While the watch itself has an edge it looks like the reflection shows the door at some kind of corner. I still don’t know if the skin tone area has anything to do with knuckles or not?