1 New Penny - Elizabeth II

Guernsey decimalized on February 15, 1971 — the same day as the United Kingdom — ending a currency system that had included the island's own shillings and doubles alongside sterling. The new penny issues were struck in advance and held ready for that single rollout date, meaning nearly all 1971-dated pieces entered circulation simultaneously rather than trickling in over months.

The bronze composition matched UK coinage of the period, though Guernsey retained the right to issue its own distinctive coinage under the bailiwick's autonomous status.