Another early to mid twentieth century sepia embroidery of a building with royal associations, this time Windsor Castle. It's in the same impressionistic/sketch style as others I've seen. Size: 17 x 12¾in (43 x 32.5cm) high x width.
I've seen enough of these, with enough different subjects but stitched in the same style, to think it most likely that they were sold as transfers.
If you know more, please do leave a comment.