Cloth Seal, Cloth Worker's Personal Seal, Privy Mark, 1580

Cloth Seal, Cloth Worker's Personal Seal, Privy Mark, Image by Derfel Found by Peter Olivant.
Found on the Thames foreshore, 20mm.

Privy mark in decorated rectangular border, date above // missing, cloth weave imprint, rivet stub blank

The date is 1580 as recorded on two parallels at the Museum of London - 93.142/188a & 93.142/188b, which also tentatively suggest the incorporated initials to be ITB(X) RF.