This is a transitional era (early 6M) alto sax. They can be great players........very sweet voice but with plenty of power. If you're thinking of getting it restored, this would be a great candidate. Please let me know if you have any other questions.
It is in great condition - I know from the previous owner that the pads have been replaced, other then that I have no idea whether it is original or restored. I use it myself and it sounds beautiful - much nicer then my original Yamaha.