UPDATE: It arrived today and to my relief it is definitely not plated. The spots in questions were just bits of black gunk that came off with my fingernail. There are some rust areas that I suspect will leave some pitting, but over all I think its in damn fine shape considering the age.

The scales are a bit warped but there are zero bug holes so I'm going to attempt to save them.

Name:  DSCN3149[1].jpg
Views: 68
Size:  24.3 KBName:  DSCN3152[1].jpg
Views: 73
Size:  28.8 KBName:  DSCN3153[1].jpg
Views: 64
Size:  28.2 KBName:  DSCN3154[1].jpg
Views: 66
Size:  20.6 KBName:  DSCN3155[1].jpg
Views: 73
Size:  17.9 KB