ok i havent exactly solved the mystery but have at
least realized a few things

first of all
it appears triparish points may have moved around a
bit over the centuries

& thats no great surprise or big deal really

so the idea at least of a couple of tripoints bumping
into each other long enough to get marked up as a
quadripoint & then subsequently disintegrating somehow

seems natural enough under the circumstances

& in this case it appears just such a displacement of
chdrmo at least did occur
from
the anciently marked hillside quadripoint position
indicated by the red arrow on the original map from
the fingle bridge cross page
http://www.dartmoor-crosses.org.uk/fingle_bridge.htm
which is repeated here for clarity
http://www.streetmap.co.uk/newmap.srf?x=274250&y=89500&z=3&sv=274250,89500&st=OSGrid&lu=N&tl=~&ar=y&bi=~&mapp=newmap.srf&searchp=newsearch.srf
to
the stream confluence position shown as a red line
junction in the upper left hand corner of this
historical map of moretonhampstead parish
http://genuki.cs.ncl.ac.uk/DEV/Moretonhampstead/ParishMap.html
about 3km up the river teign & due west of the earlier
position

& this by the middle of the 18th century at latest

& the mysterious letter e on the east face of the rock
could not have been for easton
which proves to lie west of both these multipoint
positions

& whatever parish name the e did stand for has
evidently disappeared from the neighborhood both as a
parish & as a name
unless it stands for an erstwhile much greater exeter
which is today farther to the east than easton is to
the west

but whatever this lost or retreating parish e may have
been
its absorption or displacement may well have been part
of a more general expansion by moretonhampstead at the
expense of chagford & drewsteignton as well
if not other surrounding parishes also

now
whatever the fate of civil parishes elsewhere
& notwithstanding that they are evidently ignored by
ordnance mapping hereabouts
there is some evidence of their continuing existence
on some level in at least parts of devon
for example
http://www.roundash.com/council.asp

so the above code name may well be correct for the
tripoint as it exists today in the river
if it can truly be said to survive in any real sense
but it could not have applied to the position marked
by the rock
since that not only predates the encoded districts of
teignbridge & west devon but doesnt even stand on
their border

a more accurate name for the marked tripoint would be
simply
ghost gb2do3chdrmo so far as is known
with dates unknown
if not also gb2do3chdrexmo
with the ex for greater exeter

& a more accurate name for the later position might be
gb2do3tewd ghost4chdrmo

but in any case my former chdreamo guess needs to be
revised to a very ancient ghost gb2do3chdrexmo

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