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Nice one! It sure looks like RPM-001/FS-501. If so, the scratches through STATES OF are die polishing lines and a key diagnostic. This is a tough critter to find, and I've never seen an EDS before. The depth of the die scratches might suggest that this is the elusive EDS or EMDS.
@HumblePie, amiright?
Sorry for the late reply.
Yes, you are right. It is FS-501 - That is about the only reason I purchased it.