This is a medically mummified hand, often treated with arsenic and mercury. This method has been used for a few hundred years so its hard to date this piece.
If you look closely you can see a faded number which could be a serial number from a collection.
Slight damage to the thumb as can be seen in photos.
Photos from part of the description and price includes worldwide shipping.
All the remains I sell are over 100 years old for the law, ethically sourced and respect of the living friends and relatives, I would never sell any remains with a known name as this may upset the living and that is in my opinion disrespectful. If someone is disrespected with no link to a random skull then that is their opinion and in my mind not disrespectful.