A few days ago I found this 1943 Coca-Cola bottle at an unexplored bottle dump. It is the hobble-skirt design with PAT D-105529. One the side underneath the patent it has "43.<O>48". According to this PDF file: https://sha.org/bottle/pdffiles/OwensIll_BLockhart.pdf , from 1930 to 1951 Coca Cola bottles made by Owens-Illinois had this type of code configuration on the skirt of the bottle. In the 1940's, Owens-Illinois was known to use a period next to date codes, meaning the "43" stands for year 1943. The "48" to the right of the logo was the mold code.