I have an ETO gearbox in my Tamiya Sherman, but I don't think there are any major marking on it, but I can look. I think back when ETO made these the smaller gearhead motors were less common, but now they are all over the marketplace. I'm waiting for a couple of geared 395 motors to use in my 3D printed Maus since the central hull is so narrow. A set of geared 550s are even too wide for it both lengthwise (mounting on the sponsons) and widthwise (mounted lengthwise in the hull).