Masterfully recreated by myself in Inkscape.

Banners formed an important means for organisations in general, and political parties in particular, to represent themselves in the Netherlands of before the Second World War. The SDAP (Sociaal-Democratische Arbeiderspartij) was the Dutch social democratic party during this period. After the War it merged into the newly founded Partij van de Arbeid (‘Party of Labour’). This party, incidentally, has recently also decided to again merge into a new party, with Groenlinks (‘Greenleft’) in 2026.

Returning to the SDAP, banners were used during demonstrations and congresses. It wasn’t just the party at a national level that had a banner: every regional section (afdeling) had their own one. These could be quite plain, like in this picture with the banner of the Leiden section of the SDAP, but also extremely intricate, with all kinds of interesting shapes and symbols (Haren, Brummen).

The banner depicted here is a flag ‘offered to the party leadership by the makers, the Van Oven Brothers, in The Hague, 16th of October 1911’. It can be seen in use in this photograph of the SDAP leadership during a party congress in 1917, showing, among others, Pieter Jelles Troelstra, who famously tried but failed to unleash a socialist revolution in the Netherlands.

It is also depicted on this ribbon, which shows some parts of the emblem in gold. From the source image and the image from the 1917 congress, I’m quite sure it should be all white, though. The ribbon reads ‘Federation of the S.D.A.P. Leadership Board - We demand universal suffrage and 8 hour [working] day.’

EDIT: You can see a whole bunch of banners here.