The test and closed apple keys are reminiscent of the Apple //e and //c models and the white-ish case would seem consistent with the development of the //gs during the white //c days.

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A couple of oddities: The closed apple key on the *left* of the spacebar is a bit strange... it should be an open apple if it were to match the IIgs keyboard. I can't imagine Apple getting that wrong. Also, I think the "Backspace" is inconsistent with Apple II keyboards... I'm pretty sure all the post-II+ keyboards have a "delete" key.