That's not a colorized photo. I scanned it from a 1955 encyclopedia. There is a legitimate question of what film was used and whether the color was accurately reproduced in publishing. Since it was an experiment, an unusual color might have been used.
A 1955 encyclopedia ... that doesn't mean the image was the colour shot in orginal. In 50' and 60' it was quite popular to colourise pics for printing making the publications more "attractive" to customers. All copies of the full image I have seen ( including these with the number ) are B&W pictures. So why not the colour copies if there are known many other images on the AGFA colour film taken and available then.
What is more the source image seems to be of the poor quality. I can see shifting matrices for colour printing. Or the scannning process wasn't correct. But IMHO the first point happened. All that makes me skeptical if we talk about the early colour pictures. All the doubts let me consider the shot as the titbit rather then the source for making the camo rendition.