A similar letter, with the same imprint, beginning:
<p><br>'(Deer) (bee)illy'  21 October 1799
</p>
<br>Etching and engraved writing
1799<div style="display: none;">date QS:P571,+1799-00-00T00:00:00Z/9</div>
<a rel="nofollow" class="external free" href="https://www.britishmuseum.org/collection/object/P_1861-0518-1027">https://www.britishmuseum.org/collection/object/P_1861-0518-1027</a>