Wonderful Brahma Bell! I've seen that from the National Museum in Gyeongyu and that from Bulguska. The Dharma drum thre is also nice, as may be seen in your picture here. I am fascinated by these pavillions.
Yes, the Emille Bell at the Gyeongju National Museum is probably the most famous in all of Korea. Usually at the larger Korean temples, they'll have all four of the instruments. But I tried to add pictures of the best examples of all four.