Phra That Phanom
This Buddha, name Luang Phor Ongsen is worshipped in Wat Phra That Phanom. And a few other important temples in Nakhon Phanom.
I don't have the exact details but it's highly revered there.
This piece was taken personally in Wat Phra That Phanom myself.
⭐ The original case out from temple is highly oxidised. Amulet still in top condition