Peterson St. Patrick's Day 2018, Shape 6p6

This reference example documents a Peterson St. Patrick's Day pipe from the 2018 annual release, carried under the shape designation 6p6 and identified as an Irish estate piece. Its innovations — most famously the Peterson System and the graduated P-Lip mouthpiece — shaped the vocabulary of twentieth-century pipe design, and the company's shape chart remains one of the most extensive in production . The St. Patrick's Day line occupies a distinctive place within Peterson's catalogue. Because the edition changes annually, each St. Patrick's Day pipe functions as a self-dating artefact: the year of issue is intrinsic to the line itself, which is a rarity among factory pipes that otherwise require deciphering of hallmarks or stamping styles to establish age. Dating in this case is therefore straightforward. The pipe belongs to the 2018 edition of the series, placing its manufacture firmly in that year at the Peterson works. As an archive entry, this example serves the encyclopedia as a representative of Peterson's modern commemorative output — a documented instance of how an established Dublin maker adapts its classic shape library into a dated annual series, giving future reference users a fixed point in the firm's twenty-first-century production.