Definitively, photo taken before 1922. In 1922 standard regulation describing car plates was introduced with rule of two letters preceding 1 - 5 digits (eg. KR 3546). We can see non standard plate used in 1918-22 under the military register (it was responsible for registering both civil and army cars).
Not sure of meanning of "Kr." letters, but very likely it referred to Kraków (Cracow) region.