I have been looking around for Emperor Sunjong’s signature in Hangul on the web and in my library. This is as close as I got. It is from Wikipedia. They said Sunjong, the Emperor Yunghui, name in Hangul was 융희제. Given that Emperor in Korean is황제 (thanks google translate), then would make 융 Sunjong’s name. So, the last question is thus, does the signature on the document look like a stylized and signature form of 융.
I am not sure, the signature on the document seems to be missing the bottom circle. Any thoughts? If it is an authentic signature, I wonder how rare a document like this is?