Tracking oorijzer

Oorijzer or ear irons are like the recent love of the 16th century costuming community. AFAIK the earliest find is dated to 1580, but they don't show up in the written record as anythign resembling oorijzer at all until 1674. An earlier reference is given in 1636, but the word oorijzer isn't even used. "Een zilveren mutsband, anders genaamd ijserken." And that's it.

Here's the reference. Page 200. In Dutch. SO HELPFUL. Downloaded the PDF though.