Definitely not fogged out, Dan. Could have been a replacement piece for a broken piece of glass like Quitcherbitchen has postulated. They were definitely on the far end of the supply line operating out of the Philippines and SE Asia in WWII, so it's possible that or several other reasons for it being metal occurred. I have seen other period B-25 photos with other metal covers in different places of the nose. My advice would be to keep it as it is, I did that intentianally per the photo you posted of the real Cactus Kitten in 1945 before it was lost in combat.
Cheers
Davegee
Cheers
Davegee

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