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The buttstock on your gun looks to have been replaced as well, as the form is not correct. Being the gun is a shooter, you paid about what it is worth.
The frame is not supposed to be blued, you are correct. If the Frame finish was worn and had some rust issues, the easiest way for many to "fix" this years ago would be to blue it. The bluing can be chemically removed, which will leave a dull gray finish.