Without taking into account the sticker and black tape, it doesn't look like any of haufe made T14/1. Definitely not from present production (black plastic bobbin). Old one with white bobbin had thinner wires. "Umformer"? Doesn't it mean something more like "converter"? "Überträger" is much more common in german language i think.
It looks for me (especially wire colors and thickness) like rebranded (or funny "germanized") peluso t14/1.
http://www.pelusomicrophonelab.com/parts/Transformers.html