Latest CentOS 1 user agents:

User Agent Browser Device
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.7.12) Gecko/20060202 CentOS/1.0.7-1.4.3.centos4 Firefox/53.0 Firefox 53 Unknown
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20050923 CentOS/1.0.7-1.4.1.centos4 Firefox/1.0.7 Firefox 1 Unknown