I had read that all WWII flip springs were blued and I had seen some not blue so I thought they were parkerized during a refinishing sometime. I did not think of different colors caused by the blueing process. In side, they look more light blue or bright dark blue. Then I looked at the two original rear sights and noticed the two different color springs matching two colors of the NOS springs I had. I have never seen this discussed anywhere so I posted pictures for Yous Guys.
There is just too much of this I don't know.
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