I think it is only the pictures it looks like high gloss bluing.
Also took a few pics with the oil cleaned off in the sun.
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What ever has or has not been done to the blade, please wipe that damn finger or thumb print off of the blade that you can see in the pic of the maker`s name. One of the worst things you can do is leave a finger print on any of the metal surfaces. Get some oil back on it if you have not done so already. Always wipe your bayonet off after you handle it if you are not wearing gloves.