These are some pictures of the vases. Besides the daum, there is no other identification mark on either vase.
It is really baffling that of the hundreds of pictures online, there is none that supports the signature or the style of the vase.
What makes me think there is a problem is that I have come across the 2 vases at 2 different dealers who don't know each other and both have bought it from someone migrating overseas.