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Yes, TT designates the 14" variable speed machine.
I can't answer the question about the change in serial numbers ?? I wasn't involved with that in the 70's, and can't think of a reason to do that. There were no big changes in the machine or the company at that time('78). I'll see what I can find out.
The year type serial number was also used on the 17" (GJ) and 20"(GL)
On Jan 2, 2014, at 6:17 PM, "Jim B. " <btdtrf@...> wrote: