Willy;
 
I believe that change from soft to hard chimes occur in the late 70's/earlyy 80's. This one is hard chimed for sure. The bad part is everyone says they are slow. 
 
Here a real tank for you.  Image a new set of 300 four storkers on this thing.  Can you say Battle Axe
 
http://washingtondc.craigslist.org/d...521139057.html
 
 
Kamiakze