Here are two views of a DKS "84 16120" key from the St Louis Public Library and a blank we tried to use to match with it, a Dominion lock #80N (part of the Fort 6000 series, original# K80N). Currently, we have yet to see if this blank actually works, please follow up with this note when more information is received.
UPDATE (6Mar'14): It worked, they wanted 7 more(!).
(Originally created 3/4/14 on the Evernote app)
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