A single course of ashlar blocks. It is unclear whether there is another course below or ever another above. Likely built to subdivide the whole of the room H-15. When this took place is not immediately obvious. It was certainly built later than the block 7324 immediately to its south, but whether they were built during the same phase of occupation is hard to determine. The concave mortar partially covers the extant course of blocks, suggesting either: a) the course we have was the original uppermost course and the mortar was built much later, once the floor level had risen; or b) the mortar was built after any upper courses were spoliated or otherwise removed. It is difficult to say whether the northern limit is original or not, as it is uncertain which of the Opus Reticulatum and ashlar walls was built first. While it seems most probable that the ashlar was built first, it could have either had the same extent or extended further to the north. It is hard to say without more excavation. The purpose of the cut on the east and top of the southernmost block is also unclear. It seems to have been cut in antiquity, but it is also possible it was done by a backhoe during the SAR excavation in the 90s. If ancient, it may be associated with the concave mortar 7384 immediately to its west and the other circular feature to its east