Does this shape appear in other series? No - (none recorded in image database)
Height; 5.5 cm.
Shape book 'A'
This is one of a small group of 500 numbers that are not part of the 500 Series but instead are associated with the Later Series. In a Later Series shape book numbers 500-506 are interposed between Later Series 165 and 166. The reason for this group of anomalous numbers is unknown. Most recorded examples have twig-handles (common in the Early Series but otherwise rare in the Later Series) and most carry the number suffix 'H' (although not this sole recorded 506 example).
This is believed to be as high as the supplementary group of 500 numbers in the Later Series numbers reached.