Easter Seals. Easter Charity Seals were first issued in 1934 in Elyria Ohio, by the Rotary Club, to benefit "Crippled Children." Various issues were identified by Printer's Marks (pm) from 1938-61, and Union Labels (UL) from 1962-present. U.S. Easter Seals are identified by Mosbaugh Catalog numbers. Canada Easter Seals are identified by Beattie's Catalog numbers.