Unidentified Stamp

Unidentified Stamp
Crest: A dexter cubit arm bendwise holding a scimitar impaled with a Saracen’s [Turk’s} head
Dimensions (height x width): 25mm x 17mm
Coronet: Viscount
Heraldic Charges: armhead, saracen'sscimitar
Notes:
No example of this stamp could be traced in any of the reference sources. It could be Continental.