Columbia Type N survey

[Tinfoilphono]

Back in early 2021 I posted a request for serial numbers of Columbia Type N Graphophones in collections. The response was gratifying, and with information acquired then and in the two years since, I now have 60 numbers on file. But I'm sure there are many more out there that remain unrecorded. 

 

If you have a Type N, either the regular home version or the scarcer coin-operated model, and you didn't previously respond, please let me know the serial number (either in this thread or by PM) and any pertinent details that come to mind. I am particularly curious to determine when Columbia stopped stamping the on/off lever with the word "SWITCH." I'm also interested in any Thornward numbers.

 

Your information will be kept private, but I will share any useful data information that may come from this study.

 

Thanks in advance!