This is the original logo die stamp used to make the Hummingbird limited line of exotic wood yo-yos. Early Limited models did not not carry a logo, as some of the exotic woods were very hard and difficult to impress with a logo. Shallow logo depth and machining, suggest this plate was for hot stamping on the very hard exotic woods.
The logo is etched in reverse on the plate, and the plate was pressed hard against the wood to impress the logo. A one-of-a-kind Hummingbird collectible.