Question about Dept of State Special Agents Division 1916 badge

I am seeking information about the relative scarcity and value of a US Department of State Special Agents Division badge that is the earliest design from 1916. I have had poor luck finding any useful internet sources of information about this particular badge. I have attached images of the obverse and reverse of this badge. There are a few small, shallow abrasions on the badge, the only group of them is on the scrollwork below the eagle and above the “US”. These are probably from being stored in a jewelry box by the previous owner. I appreciate any help you may be able to offer in relation to my inquiry.