This French style box easel is versatile and ideal for using outdoors for plein air painting, or for those who need a compact easel for their home studio.
I think this is a Winsor & Newton French Box Style Travel Easel. Closest I've found online is this one:
https://www.jacksonsart.com/jackson-s-french-style-box-easel?channable=0044a56964003534333535de&___store=jacksonsart_en&gad_source=1&gclid=CjwKCAjwnv-vBhBdEiwABCYQA4gsRA0tK-cCAfpqqMraBzanF4CZJrDNy4-odlqdFRgfxweKerXslxoCg0cQAvD_BwE