I have one of these, myself, but never thought to take photos of it. I also have an "official" Sega keyboard, which is just a standard Windows keyboard with the Sega logo on the top right side. From what I was told, originally these keyboards were wired directly into the adapter, but eventually were left as PS/2 connectors to lower the cost.
Yeah, most people get just the adapter to save money. I wanted the actual Sega keyboard so I could be assured I got all the keys that were "standard" for the Sega keyboard... in case anything was different.