Western Electric Special 293J Project

I have been looking for a phone project to do and found this box of Western Electric phones at a garage sale. There are six Western Electric Special 293J phone is various conditions. One of the phones has a Western Electric Denver label dated 9/14/13. I assume this is 1913.

I have not been able to find any information on this type of phone. If anyone knows of a good resource, please let me know.

Thank you.