Weldon's Practical Guide to Fancy Work. Figure 11, Square Medallion (1911).
Yarnplayers photo, on Yarn Player's facebook page, helped simplify the Weldon's Square Medallion. Pretty square with fewer picots. Once finished, I measured and see my square is a bit under 3cm x 3cm. Maybe with some blocking ....
Shuttle made by LaCossette, link HERE.
Hook by Stunning String Studio, link HERE