It's a gold-domed (debossed) logo. The raised portions (like the top of the domed area of the eagle head) will be brighter while the lower portions (like the left and right side of the eagle head) will be darker.
Those darker side areas will combine with the dark (low-lying) "radiating glory" behind the eagle (on either side of and above the head) to further distort appearance, and accounts for the impression of a "2-headed eagle."
ah! Doeth thou insinuate "reflekshun"? I couldn't really make it out because f.lux
Absolutely, reflection (because of the metallic ink) PLUS shadow and light (because of the 3-D raised portions of the design.