Unidentified Stamp

Unidentified Stamp
Two keys in pale
Crest: A dragon’s head couped
Helmet: Knight
Dimensions (height x width): 70mm x 52mm
Monogram: A W
Initial: A W
Heraldic Charges: dragon's headkeys (2)
Fairbairn’s Crests gives several examples of a dragon’s or wyvern’s head crest, but none of them corresponds to the arms described in Burke’s General armory. Despite the fact that the second initial is W, this stamp might be of continental origin.