Istanbul, I'd be actively searching for a Wade and Butcher, Ottoman and Egyptian Royal Windsor Razor, a very, very, very rare straight razor that seems to have been specially made for guests who stayed at the Royal Windsor Hotel in Cairo...you're essentially across Cairo and there might be a chance you'd find one there.

I've only seen a picture of one, and a member at another shaving forum is the only owner of one I know.

If you find one, I'll send you my address to ship it to me!