A P-51 Mustang of the New Mexico National Guard after WWII, prior to the 1947 Army-Air Force split. The New Mexico state emblem is in place of the national insignia on the fuselage. In the mid-to-late 1940s, before peacetime organizational standards were made rigid, many state NG squadrons had unofficial emblems like this on the fuselage. The wing markings were left as the national insignia.)
This is Czech-made Aero HC-2 Heli Baby helicopter, or its modified HC-102 version. Most probably, such blue portion position is latest feature, because of the most of historical photos show normal position of blue portion:
http://elfnet.hu/haditechnika/helikopterek/aerohc2.php
http://www.scale-rotors.com/kit/artikel.php?id=204
on your 1st link I found this :
same position. Same helo??
2 roundels from czechoslovakia.
Note the square ones on the Avia BH-9 and the position of the blue part on the helo (normal the blue portion is facing to the front/forward)
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