The various branches of the German Army were allocated specific branch of service colors for identification purposes.
The “waffenfarbe” is also known as ‘Branch of Service Color”. The base is a bright lemon-yellow wool, which I believe indicates use by “Signals Troops” or “Nachrichten”. The Braid is a silver or aluminum color in very good condition and includes a stamped alloy rank pip and a gold washed number three.
There is some light soiling and a few moth nips on the felt, but overall a nice example at a reasonable price!