This is a Bechuanaland OHMS, or ON HIS/HER MAJESTY'S SERVICE Cover.  This one was sent from Mafeking, Bechuanaland to Bullawayo on 12/21/1934

What makes this little beauty really special is the OVAL RESIDENT COMMISSION BECHUANALAND marking.  This is a VERY RARE cover!

This item is over $100 USD so I will ship it using Priority Mail in the US, and Registered Mail overseas.  This is to ensure that it reaches you in a safe and timely manner!