beautiful images. Thank you for sharing.
I suppose that the I-16 is silver, with black or dark red bands, black numbers and white drops and thinner lines. The spinner looks black, while the engine disk could be dark red.
The I-15bis could be dark red with white or cream bands, white disks and slogans and black numbers.
It's interesting to see that the slogan on the I-15bis has been modified on some photos.
What does the inscription mean?
Is there any other source describing these planes? Has anyone contacts with Russian forums?