I have never seen this Beatrix Potter 1890 watercolor either. via So many images are surfacing that I've never seen. So glad.
Beatrix Potter 'Mouse with a Spinning Wheel' 1890 Helen Beatrix Potter (1866 – 1943) English author, illustrator, mycologist and conservationist ink and watercolour. From the collection of Caroline Isobel Emma Halpin (née Hutton) and thence by family descent. Sotheby's archives.