Kinda hard to tell with a photo - you'd have to get whoever bought one of those to test it. That doesn't have to be a real TIROS either, possibly being a Fresnel lens with some plastic to act as a light tube for the LED - though I wouldn't rule out the possibility that part of the optic got copied if the design was stolen from Inova. Still, I've seen Polo shirts and the like in Hong Kong which look exactly like the real thing, so I wouldn't be at ALL surprised if that's a fake, especially if it's only $18 USD.