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I finally had a few minutes to take a look at the photo. My first though is that this is post WW1, likely in the 1920's. There are a few things (pocket flaps, the hats, etc.) that lead me to think that. The smaller mostrine and the use of stars for rank on the shoulder boards appear to be the 1926 modification.
However I can't see enough detail to be sure. If we could see the ribbons, that would give us a lot of information. As it is, it is difficult to know .