Unidentified Stamp

Unidentified Stamp
Crest: A lion's head couped ducally crowned between two ostrich feathers
Dimensions (height x width): 16mm x 15mm
Monogram: J N J
Initial: J N J
Heraldic Charges: feathers, ostrich (2)lion's head
It is assumed that the J of the initials stands for Johnson, but no further identification can be given at this stage. Crest matches that of the bookplate of R.A. Johnson [Franks 16561]. There is no J N J in Hazlitt’s Roll of honour. There is also nothing in Fairbairn’s Crests, nor in Papworth.