This is a wholesale offering of 10 sets of the 4 stamp set, issued by Gibraltar in 2006, Scott #1048-51, commemorating the airmail service and featuring various planes, including the Saro A21 Windhover, the Vickers Vanguard, the Vickers Viscount, and the Boeing 737. 2014 Scott catalog value is $13.00 each or $130.00 total. Face value is 2.57 pounds or about $4.12, so you're paying 25% of Scott catalog value, or about 79% of face value!