This exhibit is a Connecticut Telephone & Electric Co. J-117. The anode is external and operates by electrolytic conduction through the glass wall. This valve needed a a DC coil to allow it to be tuned.
This is a soft valve and part of the Sodion range.
This came from the Tyne Collection and is quite rare.
The circuit in which the J-117 was used - Tyne.
Thanks to Joe Gruber for sending the image.
The thin glass tube envelope is 16 mm in diameter and, including the base pins, is 108 mm tall.
Reference: Joe Gruber.
Updated November 26, 2020. shape:thin.glass.tube construction:pinch type:triode age:pre.1920 base: pin: