Unidentified Stamp

Unidentified Stamp
Crest: A cubit arm in armour with a serpent wound round it holding a spear in fess
Dimensions (height x width): 17mm x 20mm
Heraldic Charges: armserpentspear
Notes:
Neither stamp nor motto are in Fairbairn’s Crests, Burke’s General armory, nor Papworth.