Cloth Seal, Cloth Worker's Personal Seal, Privy Mark, Dyers One-Part Seal, 1500~1699, Image & Found by London Mudlark.
Found on Thames foreshore, ~15mm.
Privy mark - AR ligature attached to extended vertical of number 4, rope border around // blank
Dyers one-part (bulla type) seal, Very similar to those shown in Fig.37 in Geoff Egans 'Lead Cloth Seals and Related Items in the British Museum' which he categorises as a dyer's one part seals found ‘in some numbers ... from Trig Stairs to London Bridge’. He dates them from the late 16th to 17th centuries.