I purchased machine-made silk embroidery like this that was done in China. At a recent state fair, there was a booth with silk embroidery done by hand for sale -- also from China. (They had a demo person there doing the embroidery.)
The backs of these look like embroidery done by hand. My machine-made embroideries are much neater on the back, with lots of threads lying uniformly next to each other.
Edit: After taking a closer look at the backs, I'm thinking maybe these are machine-made backgrounds with hand work for the details and smaller items.