Unidentified Stamp

Unidentified Stamp
Possibilities for Identification: 
Neither stamp nor motto are in Fairbairn’s Crests, Burke’s General armory, nor Papworth.
Height: 
17mm
Width: 
20mm
Full Heraldic Description: 
Crest A cubit arm in armour with a serpent wound round it holding a spear in fess
Crest: 
A cubit arm in armour with a serpent wound round it holding a spear in fess
Heraldic Charges: 
Stamp Key: 
IZZZ084_s2