The camera makes this look worse than it actually is. I have it in my hands right now and there is very little red cast. It looks just like patina to me. Good catch on the take down lever as it is not the original, it is being repaired. I believe it has possibly been touched up with cold blue at one time. The safety lever is blue, doesnt look like it was ever strawed, but it is numbered to the gun. Im just nt good enough to tell for sure.
