This exhibit is a Cunningham double filament tubular Audiotron number 110 (#110). The base is home-made and looks to be ebonite.
The red printed paper identification label is marked 'Audiotron' and is of the second type used by Cunningham.
Thanks to Joe Gruber for sending the images.
The thin glass tube envelope is 19 mm in diameter and, including the UV base pins, is 92 mm tall.
Reference: Joe Gruber. Type 110# was first introduced in 1916.
Updated November 26, 2020. shape:thin.glass.tube construction:pinch type:triode age:pre.1920 base:uv pins:4 pin: