81 is almost certainly an unreasonably high age for someone in the 18th century to reach, so I'm inclined to believe this glyph depicts another number - possibly a '6'.

Numeric Glyph

81 is almost certainly an unreasonably high age for someone in the 18th century to reach, so I'm inclined to believe this glyph depicts another number - possibly a '6'.
Credit
Toby J
Taken
06/09/2018
Camera
Nikon D7100
ISO
320
Shutter
1250 second
Aperture
ƒ/5
Focal Length
16mm
Lens
Tokina AT-X 116 PRO DX II 11-16mm F2.8
License
Copyrighted
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A Numerical Mystery in a Welsh Churchyard