Dumbarton currently has 17 mapped postboxes recorded by The Postbox Hunter. The postboxes in Dumbarton include 5 recorded royal cyphers. The most common is EVIIR, recorded on 3 postboxes, representing 17.6% of the mapped total. The complete recorded cypher list is: EVIIR (3), scottish_crown (2), GR (1), no (1) and VR (1). Among the recognised royal cyphers in the data, VR is the earliest recorded and EVIIR is the most recent. The most commonly recorded postbox type is Pillar, with 7 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.