'Novitas' Neuheiten - Vertrieb Oscar Heiermann, Berlin

There is an article about this company on the TPA-project web site. The logo has a couple of minor variations, shown there.

The second example was posted in the Saar during the period in which it was administered by France and the UK under a League of Nations mandate from 1920 to 1935. An inordinate number of different postage stamps and variants were produced during this period.