Two ancient bronze drums were found in Vietnam’s central Quang Nam province.
Taken from Vietnam: From Myth to Modernity
Ancient bronze drums found in Quang Nam
Nhan Dan, 14 feb 2009
One drum is almost intact and its surface is decorated with a sun and six sunbeams in the middle and four fogs with their heads turning in a clockwise direction.
The other drum has lost the lower part and its surface has a hole in the middle. The four fogs on the surface, meanwhile, look to the anticlockwise direction.
These are very similiar to the frog drums from Laos.
http://thestar.com.my/lifestyle/story.asp?file=/2008/5/24/lifetravel/21221722&sec=lifetravel