Pendant pocket watch converted order from rare vintage coin

Product Name: Pendant pocket watch converted order from rare vintage coin
I recently inherited this rare vintage piece from a dear friend who was a world traveler. After conducting my own Google lens search, this was a coin of Austrian empress Maria Therisia. The last image I attached is one of the coin alone being sold on Etsy but I couldn't find one that was converted into a time piece such as this one. One will need a small screwdriver to access the inside as I order can't guarantee what they will find once doing so! But with the right tool on hand, it shouldn't be too difficult! Any information on this piece is greatly appreciated! Cheers (✿^‿^).