Coat of arms of Seldon

The blazon

az. on a fesse, betw. three swans heads, erased, or, ducally gorged gu. as many cinquefoils of the last. — Crest, an arm, embowed, habited with leaves, vert, grasping in the hand ppr. a swan s head, erased, or, ducally gorged gu.

A blazon is the description of a coat of arms in the technical language of heraldry. The drawing comes from that text, and from nothing else.