I have not identified this company but it published Frederick Spurgin cards, sometimes in German, which had been published by Inter.  Art or Art & Humour. It would therefore fall outside of the period covered by the "F S" study and will not be investigated further.

 ... und sie hatten einander so lieb ...

So im Vorbeigehen

[Inter-Art TINY TOTS 374]

The worst of the sea is it makes one so d... dry

[A & H SEASIDE 708 - 1921]