Thank you RCD, glad you like them!
I used Vallejo acrylic Grey Blue (watch out - I think they do Blue Grey as well!). I did a bit of research on what colour to use for 'horizon blue' and it's debatable. I think in reality various shades of sky blue were used for the uniforms, all of them being called 'horizon blue'. So in the end I just went with Blue Grey! Sorry - I mean
Grey Blue!
I must say that, like you, one of the things I appreciate most about Strelets is their dedication to covering different topics or eras, and producing WWI troops in gas masks is a case in point. Their sculpting style is a bit of, err... an 'acquired taste' admittedly!
But personally I like the eccentricity of some of their poses. It gives the figures a little bit of character and 'life'.