Steve,
I was just trying to understand what the last digits mean......There is a 17T9 on ebay right now that is exactly the same as my 17T13 other than some extra gold paint (that I can tell) even the seller has the year wrong...it's listed as a 1953 but it's 1951 all the way.
http://cgi.ebay.com/1953-Motorola-17...QQcmdZViewItem
Motorola has somewhat confusing model numbers. Thanks for the help ! I do appreciate it !
Charles