The complete set in detail

MT41.42
Sc.No. J39/48
1954 : Due Stamp - Carrier Pigeons and Sikorsky helicopter - se tenant pair 1 F.

MT43.44
Sc.No. J40/49
1953 : Due Stamp - Sailing Vessel and S.S. United States - se tenant pair 2 F.

MT45.46
Sc.No. J41750
1953 : Due Stamp - Old Railroad Engine and Modern Locomotive - se tenant pair 3 F.

MT51.52
Sc.No. J44/53
1953 : Due Stamp - Da Vinci's flying machine and Rocket - se tenant pair 10 F.

MT57.58
Sc.No. J47/56
1953 : Due Stamp - Old Mail Coach and Railroad Mail Car - se tenant pair 100 F.