Caboolture Hospital 25th Anniversary Logo

25th elegant teal healthcare Source: https://metronorth.health.qld.gov.au/news/send-memories-caboolture-hospital-25-year-celebrations

This logo does a great job of using the original word mark as the base for an anniversary extension. By placing some brand-related shapes above they gave themselves space for placing their anniversary number. Not only the number, in fact, but the word years as well to create a nice, balanced logo that ties strongly back to the original brand.