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To be terribly honest, Terry, I thought that was the base of the sight assembly that extends through the "shelf" or lip just inside the hood, near the defroster duct.I think you could be right there Dave. But the ring sight, linked to the rear guns on the earlier mount up to mid-production B-17G, not the 'Cheyenne' modification, which had a larger glazed area, 'ball mounted' guns, and in internal reflector sight.
Yeah, Gary...That's '909'...and I got it wrong !!! :-/
Wow! You just gave that one to me. I was no where close. Try this one.
Japanese...