M1A1 Turret Sight Housing

I am finally working on this kit which I had, but I was originally reluctant due to its scary complexity. I’ve done fine with the barrel after figuring it out (the instructions are a bit confusing), but I noticed that the sight housing is transparent. I have an old Abrams book and a book on the Gulf War, but even they don’t help as to what should be on the “back” of the sight housing transparent area. Silver? Blue? Black?

The sight is not transparent. One side is a night site and is tinted a purple-blue color. The other side is a day sight and has a yellow tint.

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