How old is my LX?

I have two LX's, one was bought new by me in jan 1981 and has serial # 52578xx, the other was bought used two years ago and has serial# 52632xx. How old might this second one be? I guess somewhere around 81-83 since the serials are just some 5000 units apart. Do someone have a nifty list of numbers with which to check the age of cameras?

just curious -- MW

I don't have the answer, but that would be really interesting to find out with my used LX's...