Cloth Seal, Cloth Worker's Personal Seal, Privy Mark, IM, 1500~1825

Cloth Seal, Cloth Workers Personal Seal, Privy Mark, IM, Image by StuE, Found by Nasher.
Found near Baldock, Hertfordshire, 25mm, 8.9g.

Privy mark 4 above I M // 472 stamped

Unusual privy mark consisting of a figure 4 with extended base above the initials IM.