Ornithological Society · twenty-fifth anniversary

4 rekords ta’ bolli · 3c / 8c / 13c / 23c

Original basic design/value types; documented major paper, watermark and perforation alternatives are separately identified. Unchanged reprints, errors and plate/pane positions are excluded.

• J. Farrugia, contemporary issue study, PSM 16(2), pp. 29–32 ↗