It could be an "egg topper" for soft boiled ostrich eggs... but my money is that it's for making perfect english muffin perforations. Abusive comment hidden. (Show it anyway.)
Alpha/numeric die stamps for metal. Used for serial numbers.Or... Replacement neck plugs for Frankenstein's Monster. Abusive comment hidden. (Show it anyway.)
Or... Replacement neck plugs for Frankenstein's Monster.