Button with strange insignia on it

[Christophorus]

Morning everyone,
Need your help to identify this button please.
The insignia has the same symbol.

"AT"??
The bakelit?? button looks german made for me... but not sure at all...

Found inside a ww2 scho-ka-kola box.

Any help would be greatly appreciable.

[Stive]

As an opinion, it is from some civilian uniform, for example restaurant or uniform of staff of a rich estate
IMO

[Christophorus]

Many thanks Yury,
I would never have imagined such a use.
You might be right!!
Thanks again