The Hong Kong stamp series featuring Queen Elizabeth II was issued on June 12, 1973. Designed by Arnold Machin and printed by Harrison & Sons Ltd., these stamps measure 21 x 25 mm and were produced using photogravure printing. They have a perforation of 15 x 14¼ and feature the watermark "St. Edward's Crown Block CA Multiple [Up]." Two notable stamps from this issue include the 20-cent stamp in blue violet, cataloged as Michel HK 270X, Stamp Number HK 277, Yvert et Tellier HK 268, and Stanley Gibbons HK 285, as well as the 10-cent stamp in red orange, listed as Michel HK 268X, Stamp Number HK 275, Yvert et Tellier HK 266, and Stanley Gibbons HK 283. Both stamps were released as part of the Queen Elizabeth II series from 1973 to 1982 and were intended for daily postal use. The themes represented in this issue include famous people, queens, royalty, women, and heads of state. These stamps are significant pieces of Hong Kong's postal history during the British colonial era and remain sought after by collectors worldwide. The 1979 Butterfly series, issued on June 20, features a 20-cent commemorative stamp showcasing Hong Kong's diverse wildlife. Designed by Jane Thatcher and printed by Harrison & Sons Ltd. using photogravure, this multicolored stamp measures 28 x 45 mm, has a perforation of 14½, and is unwatermarked. Cataloged as Michel HK 353, Stamp Number HK 354, Yvert et Tellier HK 347, and Stanley Gibbons HK 380, it belongs to the thematic category of animal life, specifically butterflies and moths. This issue highlights Hong Kong's natural beauty and contributes to its philatelic heritage.