Vintage Reverse Carved Opalite Opaline Glass Volcano or Mountain Japan Pendant

Vintage Reverse Carved Opalite Opaline Glass Volcano or Mountain Design Japanese Pendant. Unknown metal but I think it’s brass. The pendant measures about 1-1/2″ tall, with bale, by 1-1/8″ across. No chips or scratches. Please use the pictures of your main source of reference, but feel free to message me with any questions at all. Thanks for looking!