OK, I know the IIgs was the first ADB system, hence first Apple ADB keyboard, but I have heard several different keyboards refered to as "the IIgs keyboard". M0487 Small, no function or direction keys, and indents on both sides of the rear where the ADB plugs are. MO333 Apple Desktop Bus Keyboard, small like above, similar in shape to the 487 but does not have the trim around the keys... basically, the keys go straight to the edge of the keyboard. The keys also have indentions around the edges. 661-0603 Apple Keyboard II, number may be a replacement part number.