Unidentified Stamp

Unidentified Stamp
Arms:
Quarterly 1 & 4. A chevron cotised between three annulets a crescent for difference (unidentified) 2 &3. A chevron engrailed between three cats heads erased gardant (Beauchatt)
Crest: A cat's head erased gardant crowned
Helmet: Esquire
Dimensions (height x width): 61mm x 46mm
Monogram: W B
Initial: W B
Quarterings: Quarterly 1 & 4. A chevron cotised between three annulets a crescent for difference (unidentified) 2 &3. A chevron engrailed between three cats heads erased gardant (Beauchatt)
Heraldic Charges: annulets (3)cat's headcats heads (3)chevron cotised betweenchevron engrailed between
Notes:
These are not the arms of William Bourne, the mathematician, portreeve and innholder of Gravesend, who died in 1583. The second and third quarters seem to be the arms of Beauchatt. The crest would also seem to be that of Beauchatt. It is possible that the unidentified and Beauchatt quarters are reversed, making the owner of this stamp W. Beauchatt. Papworth lists 27 instances of the 1st quarter, but only one, Boffrey, begins with B.