Chromo-litho. novelty double-sided card c.1910.

Chromo-litho. novelty. I don’t know what to say about this. I couldn’t resist buying it. It could be 2 postcards mounted on card back-to-back but I can’t tell without damaging it. I’ve never seen them before so I have no knowledge of them as postcards. It’s roughly the same size as a standard postcard. On one side there’s a man swigging from a bottle and on the other there’s a man grinning and defecating. There is what appears to be coloured sand behind a transparent panel. Chromo-litho. printing, c.1910.
The website likes me to write at least 200 words about each thing I list but sometimes it’s very difficult.
Most chromo-litho. printing was done in Germany and, although there are no names on the card, I think this is German. New Year postcard, 1909. is an example of another chromo-litho. postcard I’ve listed on this site. Looking on the internet for anything similar, I can only find the sort of seaside postcard with which we’re all familiar. http://eBay.co.uk has a lot.
If I were keeping it, I’d be tempted to put it in a postcard frame (with a glass back) and hang it in the lavatory. It doesn’t fit in with my collection of postcards although I do like the expression on his face.