This town line is a little more confusing the one nearby. There are two dividers here: the original, smaller stone marker and the taller one which is similar to the divider the other Line It Up cache is hidden on. However, the two dividers here do not line up, and are actually placed next to each other. If you were to be in the exact right spot, you'd be in Seekonk for one sign...and in Rehoboth for the other! For good measure, this was placed smack dab in the middle of the smaller marker, so it'll be your call to decide what town you find the cache in!
You're looking for the typical 4Swans' micro container. Please rehide so it's at least a little covered and BYOP as mentioned before.