Codes used in several countries
OS on a licence plate
OS is an area code in 2 countries. The plate's style and country code tell them apart.
Croatia
OS 1234-ABCode details →Osijek-Baranja County
named after Osijek
Germany
OS-AB 1234Code details →Osnabrück (Lower Saxony), Osnabrück (Lower Saxony)
Croatia
Germany