It is a printing plate for a newspaper or magazine. In the 1930s Winchester marketed a lot of products under their name even though they weren't actually made by them. They had flashlights, roller skates, and lots of tools and sporting goods. I'd say yours was probably a plate for advertising the chisel which they marketed a lot of, or it may have been for an ad for tools in general. I have a similar one with the copper facing remaining for a fishing lure. Cool find!!