Portslade by Sea currently has 46 mapped postboxes recorded by The Postbox Hunter. The postboxes in Portslade by Sea include 3 recorded royal cyphers. The most common is EIIR, recorded on 20 postboxes, representing 43.5% of the mapped total. The complete recorded cypher list is: EIIR (20), GR (18) and GVIR (5). Among the recognised royal cyphers in the data, GVIR is the earliest recorded and EIIR is the most recent. The most commonly recorded postbox type is Pillar, with 27 mapped examples. The data contains 3 different recorded postbox types. Across the available tagging data, 3 designs are represented. This information is generated from the latest postbox location and tagging data available to The Postbox Hunter.