Got this one in today. I agreed to work on it for a friend. It's stamped 38 - 05 on the bottom left leg, but nothing indicating it's an 89 variation. But I'm not sure what it is. The back door is labelled 4300, 4500, 4600 series. My first impression is that it's a cheap version of the former 89. Right now I'm not looking forward to it. Any opinions out there on these? Problems to look for?