The seal, found at Furtho, has been identified as that of Henry Cheyne.
It is in the keeping of the National Museums of Scotland, whose description of it is below:
Seal-Matrix: Henry Cheyne, bishop of Aberdeen (d.1328×29)
Henry Cheyne, bishop of Aberdeen (d.1328×29)
IMAGE DESCRIPTION (OBVERSE)
Single-sided seal depicting the Assumption of the Virgin, with a full length figure of the Virgin with nimbus, a palm branch in her right hand and a book in her left, within a *vesica-shaped* *wavy* aureole. Four angels on either side support the aureole, and there are two others at the top, each waving a thurible; between them is the Father crowning the Virgin. Background of seven stars, three within and four above the aureole; this is all within an oval panel with five *cusps* on either side and a church-like canopy at the top. Beneath the oval within a *quatrefoil* panel is the bishop with a mitre, kneeling to *sinister*.
IMAGE DESCRIPTION (REVERSE)
PRESVLIS : ESTO : PIA : MEMOR : ASCENDENDO : MARIA
Dimensions: 1 1/16 × 1 7/16 in.(54 mm × 38 mm) Note: all impressions noted are 1292 or later. SCRAN dates it to c.1282. SW I, p.122. Scran ID: 000-180-001-771-C