Unidentified Stamp

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