Seen on eBay, a prototype of a 17-inch MacBook Pro motherboard, in its 2007 version. The seller offers it for $200.
Apart from the unusual green color (although red is more common for prototypes), the board incorporates some debug connectors. The photo does not allow verification of the GPU model, but the size and brand (nVidia) leave little doubt that it is the G84 (GeForce 8600M) from the final version. Given the frequency, the CPU is presumably a Core 2 Duo T7700, a model with two cores at 2.4 GHz. Otherwise, nothing special.
A reader (thanks Alex) found the schematic of the card in question (Mantaro), so there is an XDP connector (an Intel debug connector) and the connector for a SIM card.