Value of a mint "Werkschutzleiter" Cufftitle ??

[zbv500]

Hello all,

i will sell that CT but i have no clue about the value at all. It is a factory find from the "Thiele & Steinert" company. Still with metal seal and paper tag from the factory. Also the original envelope were it was stored is present. Absolutly mint condition.

Any idea about the value ?

Thank you Jens