Hard to tell for sure, but in photo it looks nickel plated. The other point to note is the absence of a rear counterguard. This never was a regulation-compliant variation, but many companies made them for private purchase, but not until long after the war. Why do we think this is a presented sword? It doesn't look like a presentation piece. Is there something in the certificate referring to a presentation, or is the certificate just a recognition of the individual's service? (I can't quite read the certificate wording.) If not a presentation, I would suspect this sword might be a private purchase by the individual, probably for GAR use.