The Coronet Twelve-20 is a British-made box camera produced by Coronet Camera Company of Birmingham, taking 120 roll film. It was a budget-priced snapshot camera aimed at the entry-level market.

With only a single recorded UK auction hammer result, the Coronet Twelve-20 sells for around £20 at saleroom level today, reflecting wholesale prices achieved before commission. Values at this end of the market are highly condition-sensitive, and clean examples with original cases or boxes can be worth modestly more than plain bodies.