Bath Large Sideways Duplex Cancels

Six large sideways duplex cancels were registered for Bath, from 20th February 1855 to 13th November 1857.  I only have examples of the first two as shown on the sheets below.

The cancel on the second envelope above appears to be the same even though the second Bath large sideways duplex cancel had been registered eight months before it was posted.

Both cancels above are the second cancel registered on17th August 1855; the "H" of "Bath" has a short right-hand foot.