I believe it is a version of the figure-8 capsule which Neumann internally called "CM 7" and which the "brown books" of German broadcasting called "M 8"--a single-diaphragm, large-diaphragm design with a frequency range up to maybe 8 kHz.
But I don't have any Telefunken "ELA Sammelliste" or ELA price list showing a "/2" version of it. In the July, 1939 "ELA Sammelliste" the figure-8 capsule's designation was still "Ela MZ 031/1" while the other two in the series (the Ela MZ 026 and Ela MZ 032) had apparently just advanced from /1 to /2 since the previous year (relying on a different Telefunken publication). If "Ela MZ 031/2" was an official version then it must have been introduced during the war.
--best regards