First World War German Propaganda Postcard showing Victorious Soldiers Dancing Tango with Each Other in defeated London

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Ray Batchelor writes:
“This image was downloaded from the timeline of the Instituto Argentino del Tango Facebook page.

I find this image interesting because, not only does it seem in comic form to prefigure the activities of Queer Tango London with the “Londoner Tango Club” having [albeit, uniformed soldiers, all men] same-sex couples dancing tango, those creating the postcard – which was presumably meant to encourage German Soldiers – judged that in, say 1914, the year after European “Tangomania” peaked, showing those soldiers wholly at ease dancing tango with one another might seem amusing, but not, apparently, threatening to their masculinities.”

What do you think the copyright status of this image is?
Ray Batchelor believes: “The image is out of copyright.”

The image url:
https://www.facebook.com/iatango/photos/a.1415464155442836.1073741828.1410652795923972/1422920964697155/?type=1&theater