Cloth Seal, Portsmouth Seal, Three Crescents & Star, Image & Found by Derfel.
Found on the Thames foreshore, 34 x 20mm.
Shield bearing three crescents around a five pointed star, (E)R above // corners of a madderbag ?
A two disc cloth seal with broken connecting strip showing arms that include the star above a crescent featured in the arms of Southampton but with three crescents as found in the arms of William de Longchamp.
Michel Royer found the following in the Encyclopædia Britannica, 1780, p.3599, Heraldry, Example of Celestial Figures, 19, "Gules, a Mullet between three crefcents Argent;" borne by the name of Oliver.