goverton,
I echo the photo request, but site unseen ...
three horseshoes could be three "C"'s, roman numerals at 100 for each 'C' could
mean a distance of 300 units, varas, yards, feet, rods, chains, leagues, ect..
lots to work out, other signs in the area, like Clay said is needed for context!
hope this helps a little..waiting for the pics to show more data
rangler