[78-L] Columbia Demonstration 78

[Bryan Wright]

Does anyone know when the Columbia "Double-Disc" demonstration record  
dates from? I've got one in front of me with matrix 16349-8 for the  
talking side. (The matrix number for the "Kentucky Babe" quartet side  
is illegible under the label.) Looking at the introduction to the  
Columbia master book, the matrix series went up to 4999 then jumped to  
19100. So where does this one fall?

Thanks,
Bryan W.