Doctor bag frame, you can get the patterns here:
http://www.lzpattern.com/leather-bag-patterns-catagory/leather-doctor-bag-sewing-patterns-bag-pattern-leather-patterns
and
http://www.lzpattern.com/leather-bag-patterns-catagory/leather-craft-patterns-bag-pattern-leather-patterns-stitch-patterns-crochet-patterns-leathercraft-leather-craft-leather-crafting-%20leather-carving-leather-art-leather-working-leather-tools-leather-craft-tools-leathercraft-tools-handmade-tools-CLD-10