Budget iPhone rear shell leaked?

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Could this be the rear case of the long-rumored low-cost iPhone? Tactus (via Macrumors) thinks so.

While Tactus doesn’t have a notable track-record in such leaks, the design does appear reasonably consistent with the majority of rumors so far. It’s a plastic shell, similar dimensions to the iPhone 4 but a little thicker as you’d expect with a polycarbonate casing.

Tactus also claims to have some details of the phone’s spec:

I’ve also heard on the grapevine that the alleged budget iPhone will have an A5 processor like the iPad Mini with a 32nm diecast. It’s also rumoured it will have a 3.5 inch retina screen, much like the 4S, but not as big as the iPhone 5 … I’ve also discovered the factory producing this secretive project have confirmed the device will be available in Black, White, Blue, Red and Yellow

Real or not real? Let us know your view