Not sure if they did it with that generation, but the model number (RD-xxxx and FD-xxxx) should be stamped on the other side of the upper knuckle of the rear derailer (like, turn the unit over and swing the pulleys out like the bike is using a low gear, it should reveal the numbers), and the shiny cage of the front derailer (edit: or inside the seat tube clamp), respectively. Off the top of my head I think those are 8 speed RD/FD5500 parts from the very early 90s.
Last edited by Raiden; 06-24-18 at 03:25 PM.