Vintage GERBER C Models fixed blades

[cosmolady]

I have been starting to sell some of my deceased father's knife collection on eBay. Didn't really know what to expect but so far it is going very well. Still, I like to do my research first. I have two vintage Gerber fixed blades that I cannot seem to find any information on. One is a C300B and the other a C425. Both have thick round stag-type handles. The C425 has a handle unlike I've seen before -- very unique -- not sure if it is stag or some other type of bone. I am only seeing posts about these models of knife with a green vinyl handle, which I understand was a version they manufactured before the stag handles? These knives, I think, are from the 70s but could be older. ANY information anyone could provide about them would be greatly appreciated! Thanks~