Unidentified Stamp

Unidentified Stamp
Arms:
Quarterly 1 & 4 on a bend three mullets pierced 2 & 3 three horses heads couped (Slade)
Crest: A wyvern
Dimensions (height x width): 26mm x 25mm
Monogram: I D
Initial: I D
Quarterings: 1 & 4 on a bend three mullets pierced 2 & 3 three horses heads couped (Slade)
Heraldic Charges: wyvern