4 line violet cachet lower left underinked but all readable (hint of a crease through) 24th - 29th SEPt. experimental airmail, no contents, opened neatly top edge.   LANCASHIRE, NORTHERN IRELAND, SOCIAL HISTORY.    HAVE A LOOK AT OUR OTHER AUCTION AND BUY IT NOW EBAY ITEMS - MORE ADDED REGULARLY - PLEASE LEAVE FEEDBACK.