0,303" Cuff Links

Is this the cartridge collecting equivalent of wearing your heart on your sleeve?

ebay.co.uk/itm/1942-303-Brit … 1040477%26


I consider things like this collectible if they are made by the factory that made the cartridges. There are samples of things like that. CBC of Brazil seems to have made a lot of stuff like that for giveaways to clients, etc.