GB half penny I came across this surely a double clipped doesn't exist ? Regardless its staying in my error collection. Sorry Iphone pics again new USB microscope coming tomorrow.
Planchets aren't actually clipped. They are incomplete. The planchet would be punched to close to a previous planchet hole. Straight incomplete planchets occur at the edge of the sheet. There can't be an example with 2 opposite of each other. Altered coin IMHO
Those were my thoughts as well, though I'm glad to hear it confirmed by someone who's more of a specialist in errors than I am.