Season brand Sardines was previously certified as an O/UP product (Kosher for year round use as well as Pesach). However, due to Covid-19 related issues, this product is now produced as a non-kosher item and the O/U has been removed. There may be O/U and non-O/U products available on your supermarket shelves simultaneously. Products bearing the O/UP symbol on the shelf is, in fact, kosher. Check each can carefully before purchasing.