Cloth Seal, Cloth Worker's Personal Seal, Pictorial Device, Mermaid, AC

Cloth Seal, Cloth Worker's Personal Seal, Pictorial Device, Mermaid, AC, Image by Derfel, Found by Peter Olivant.
Found on Thames Fore Shore, 23mm.

X / XHK // Mermaid holding object in left hand, A C to sides

The head and top right of body are missing. The cloth worker is denoted by this pictorial device and probable initials AC.