4mm Flobert with Rsd "SK" headstamp

Here is a raised SK headstamp on a 4mm Long Flobert new primed empty. Any ideas who made it?
4mm%20SK%20Folbert

Thanks

Paul

Hi Paul,

It was made by Seraphin Keller, Hirtenberg, Austria.

Regards,

Fede

Fede,

Thanks for the quick reply.

Paul