S42, 1936, P-08 original?

A friend of mine has a P-08 for sale in which I might be interested. The problem is that I am not sure it is in all original condition. The pistol is an S/42, 1936 dated, example. Serial is in the 80xx range. All numbers match except for the mag. Finish "appears" original and is similar to other P-08 manufactured in those years. However, trigger, ejector, safety lever etc. are not oxidized. They are blued or, possibly, heat blued. That's what puzzle me as I have often read that these parts were oxidized during the years 1934-38 on Mauser manufactured P-08. Yet, my friend insists his P-08 is all original. Is it possible that this pistol is a subvariation? I am no expert in Lugers and your opinion would be much appreciated. Thanks you all in advance. Regards.