Are these x-rays consistent with a girl of her age? Does the number on the image contain any information that would narrow down when the x-rays were taken? (yes she was living in Denver)
X-rays normally contain identification markers to indicate the side, the date, possibly name and other information. It looks like you've cut part of the x-rays off but it looks like there's a treating MD's name at the top.
The date could be 9th August 1939, and the 1636 a clinic ID or something else. It's not a timestamp as it's the same in both x-rays. The L means left arm.
It clearly is an x-ray of a greenstick fracture of the distal radius in a child, because the epiphyses have not yet fused.