Another square-shaped yo-yo by Holgate but the edges have been rounded and smoothed; has yellow logo and the words "world's only square yo-yo" and "Blazing Blue" on the sides.
Holgate Toys has been making handmade wooden toys in the USA since 1789.
Of interest... To see all non-circular yo-yos in this museum, in the left panel, select Exhibits.
In the right pane, in the Name/Model field, type shape, then select Browse.