I will have to defer to your knowledge of Remington pin material, since I don’t know that much about Remington.
After making my first post I went to eBay and looked at the original auction for the knife. What I saw in some of the other pictures raised far more questions in my mind than the first picture. The pile side handle is a mess!
Despite the sellers claims that there are no cracks in the handles this obviously appears to be a crack right through the pin!
And what is up with the cobbled mess with that pile side handle pin? I am thinking this knife probably did not leave the factory like that.
I am not sure what happened, whether someone tried to install a second pin or if the first pen was bent over and someone tried to spin it down anyway. I believe I see the circular markings up to pin spinners not just one spinner as is normal.
Looking at the pile side I think it is probably original bone that someone tried to repair. If someone put new bone handles on that knife, why didn’t they just replace a handle if they broke it instead of trying to cobble it together?
I don’t think the bone on the mark side handle has been removed however the rocker pin may have been replaced. You noted it was nickel silver and the handle pins were brass and you said Remington did not mix pins on their production knives, so it stands to reason that the pin was replaced.
This knife has definitely been messed with though my
best guess is the handles are the original bone.
At any rate, given all the problems I see in this knife I think the price it sold for is ludicrous!